diff --git a/src/dusk/animation/CMakeLists.txt b/src/dusk/animation/CMakeLists.txt
index 68bb619a..7696f9c4 100644
--- a/src/dusk/animation/CMakeLists.txt
+++ b/src/dusk/animation/CMakeLists.txt
@@ -7,5 +7,4 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
   PUBLIC
     easing.c
     animation.c
-    animationproperty.c
 )
diff --git a/src/dusk/animation/animation.c b/src/dusk/animation/animation.c
index 0007eacc..1380bd6b 100644
--- a/src/dusk/animation/animation.c
+++ b/src/dusk/animation/animation.c
@@ -8,86 +8,45 @@
 #include "util/memory.h"
 #include "util/math.h"
 
-void animationInit(animation_t *anim) {
-  memoryZero(anim, sizeof(animation_t));
-  eventInit(&anim->onStart);
-  eventInit(&anim->onComplete);
+void animationInit(
+  animation_t *anim,
+  keyframe_t *keyframes,
+  uint16_t keyframeCount
+) {
+  assertNotNull(anim, "Animation pointer cannot be null.");
+  assertNotNull(keyframes, "Keyframes pointer cannot be null.");
+  assertTrue(keyframeCount > 0, "Keyframe count must be more than 0.");
+
+  anim->keyframes = keyframes;
+  anim->keyframeCount = keyframeCount;
 }
 
-animationproperty_t *animationAddProperty(animation_t *anim, float_t *target) {
-  assertTrue(
-    anim->propertyCount < ANIMATION_PROPERTY_COUNT_MAX,
-    "Property count exceeds ANIMATION_PROPERTY_COUNT_MAX"
-  );
-  animationproperty_t *prop = &anim->properties[anim->propertyCount++];
-  prop->keyframeCount = 0;
-  prop->target = target;
-  return prop;
-}
+float_t animationGetValue(animation_t *anim, const float_t time) {
+  assertNotNull(anim, "Animation pointer cannot be null.");
+  assertNotNull(anim->keyframes, "Keyframes pointer cannot be null.");
+  assertTrue(anim->keyframeCount > 0, "Keyframe count invalid.");
+  assertTrue(time >= 0, "Time must be non-negative.");
+  
+  keyframe_t *start;
+  keyframe_t *end;
+  keyframe_t *last = anim->keyframes + anim->keyframeCount - 1;
+  keyframe_t *current = anim->keyframes;
+  start = current;
 
-void animationUpdate(animation_t *anim, float_t delta) {
-  assertNotNull(anim, "Animation cannot be null");
-
-  if(
-    (anim->flags & ANIMATION_FLAG_FINISHED) &&
-    !(anim->flags & ANIMATION_FLAG_LOOP_ENABLED)
-  ) return;
-
-  bool_t wasStarted = (anim->flags & ANIMATION_FLAG_STARTED) != 0;
-  anim->flags |= ANIMATION_FLAG_STARTED;
-  anim->time += delta;
-
-  float_t duration = animationGetDuration(anim);
-  bool_t justFinished = false;
-  if(anim->time >= duration) {
-    if(anim->flags & ANIMATION_FLAG_LOOP_ENABLED) {
-      anim->time = mathModFloat(anim->time, duration);
-    } else {
-      anim->time = duration;
-      if(!(anim->flags & ANIMATION_FLAG_FINISHED)) {
-        anim->flags |= ANIMATION_FLAG_FINISHED;
-        justFinished = true;
-      }
+  do {
+    if(current->time > time) {
+      end = current;
+      break;
     }
-  }
+    start = current;
+    current++;
 
-  for(uint8_t i = 0; i < anim->propertyCount; i++) {
-    animationproperty_t *prop = &anim->properties[i];
-    if(prop->target != NULL) {
-      *prop->target = animationPropertyGetValue(prop, anim->time);
+    if(current > last) {
+      end = start;
+      break;
     }
-  }
+  } while(true);
 
-  if(!wasStarted) eventInvoke(&anim->onStart, anim);
-  if(justFinished) eventInvoke(&anim->onComplete, anim);
-}
-
-
-void animationReset(animation_t *anim) {
-  anim->time = 0.0f;
-  anim->flags &= ~(ANIMATION_FLAG_FINISHED | ANIMATION_FLAG_STARTED);
-}
-
-bool_t animationIsFinished(const animation_t *anim) {
-  return (anim->flags & ANIMATION_FLAG_FINISHED) != 0;
-}
-
-bool_t animationIsStarted(const animation_t *anim) {
-  return (anim->flags & ANIMATION_FLAG_STARTED) != 0;
-}
-
-bool_t animationIsLooping(const animation_t *anim) {
-  return (anim->flags & ANIMATION_FLAG_LOOP_ENABLED) != 0;
-}
-
-float_t animationGetDuration(const animation_t *anim) {
-  float_t duration = 0.0f;
-  for(uint8_t i = 0; i < anim->propertyCount; i++) {
-    animationproperty_t *prop = &anim->properties[i];
-    if(prop->keyframeCount == 0) continue;
-    float_t lastKeyframeTime =
-      prop->keyframes[prop->keyframeCount - 1].time;
-    if(lastKeyframeTime > duration) duration = lastKeyframeTime;
-  }
-  return duration;
+  float_t t = (time - start->time) / (end->time - start->time);
+  return mathLerp(start->value, end->value, easingApply(start->easing, t));
 }
\ No newline at end of file
diff --git a/src/dusk/animation/animation.h b/src/dusk/animation/animation.h
index 90b81528..5a76bdaf 100644
--- a/src/dusk/animation/animation.h
+++ b/src/dusk/animation/animation.h
@@ -4,87 +4,31 @@
 // https://opensource.org/licenses/MIT
 
 #pragma once
-#include "animationproperty.h"
-#include "event/event.h"
-
-#define ANIMATION_PROPERTY_COUNT_MAX 8
-
-#define ANIMATION_FLAG_FINISHED (1 << 0)
-#define ANIMATION_FLAG_STARTED (1 << 1)
-#define ANIMATION_FLAG_LOOP_ENABLED (1 << 2)
+#include "keyframe.h"
 
 typedef struct {
-  animationproperty_t properties[ANIMATION_PROPERTY_COUNT_MAX];
-  uint8_t propertyCount;
-  float_t time;
-  uint8_t flags;
-  event_t onStart;
-  event_t onComplete;
+  keyframe_t *keyframes;
+  uint16_t keyframeCount;
 } animation_t;
 
 /**
  * Initializes an animation.
  * 
  * @param anim The animation to initialize.
+ * @param keyframes The keyframes to use for the animation.
+ * @param keyframeCount The number of keyframes in the animation.
  */
-void animationInit(animation_t *anim);
+void animationInit(
+  animation_t *anim,
+  keyframe_t *keyframes,
+  uint16_t keyframeCount
+);
 
 /**
- * Adds a new animated property. The caller owns target and must keep it valid
- * for the lifetime of the animation.
+ * Gets the value of the animation at a given time.
  * 
- * @param anim The animation to add the property to.
- * @param target Pointer to the float to write interpolated values into.
- * @return A pointer to the new property.
+ * @param anim The animation to get the value from.
+ * @param time The time at which to get the value, in seconds.
+ * @return The value of the animation at the given time.
  */
-animationproperty_t *animationAddProperty(animation_t *anim, float_t *target);
-
-/**
- * Advances the animation by delta seconds and writes interpolated values to
- * each property's target pointer.
- * 
- * @param anim The animation to update.
- * @param delta The time to advance the animation by, in seconds.
- */
-void animationUpdate(animation_t *anim, float_t delta);
-
-/**
- * Resets the animation to the beginning, clearing Started and Finished flags.
- * 
- * @param anim The animation to reset.
- */
-void animationReset(animation_t *anim);
-
-/**
- * Returns true if the animation has finished (i.e. reached the end of its
- * duration and is not looping).
- * 
- * @param anim The animation to check.
- * @return true if the animation has finished, false otherwise.
- */
-bool_t animationIsFinished(const animation_t *anim);
-
-/**
- * Returns true if the animation has been started (i.e. animationUpdate has
- * been called at least once).
- * 
- * @param anim The animation to check.
- * @return true if the animation has been started, false otherwise.
- */
-bool_t animationIsStarted(const animation_t *anim);
-
-/**
- * Returns true if the animation is set to loop.
- * 
- * @param anim The animation to check.
- * @return true if the animation is set to loop, false otherwise.
- */
-bool_t animationIsLooping(const animation_t *anim);
-
-/**
- * Gets the total duration of the animation (based on the keyframes).
- * 
- * @param anim The animation to get the duration of.
- * @return The total duration of the animation, in seconds.
- */
-float_t animationGetDuration(const animation_t *anim);
\ No newline at end of file
+float_t animationGetValue(animation_t *anim, const float_t time);
\ No newline at end of file
diff --git a/src/dusk/animation/animationproperty.c b/src/dusk/animation/animationproperty.c
deleted file mode 100644
index ec74a926..00000000
--- a/src/dusk/animation/animationproperty.c
+++ /dev/null
@@ -1,55 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#include "animationproperty.h"
-#include "assert/assert.h"
-
-void animationPropertyAddKeyframe(
-  animationproperty_t *prop,
-  const float_t time,
-  const float_t value,
-  const easingtype_t easing
-) {
-  assertNotNull(prop, "Property cannot be null");
-  assertTrue(
-    prop->keyframeCount < ANIMATION_PROPERTY_KEYFRAME_COUNT_MAX,
-    "Too many keyframes added to property"
-  );
-  assertTrue(time >= 0.0f, "Keyframe time cannot be negative");
-
-  keyframe_t *frame = &prop->keyframes[prop->keyframeCount++];
-  frame->time = time;
-  frame->value = value;
-  frame->easing = easing;
-}
-
-float_t animationPropertyGetValue(
-  const animationproperty_t *prop,
-  const float_t time
-) {
-  assertNotNull(prop, "Property cannot be null");
-  assertTrue(time >= 0.0f, "Time cannot be negative");
-
-  if(prop->keyframeCount == 0) return 0.0f;
-
-  uint8_t last = prop->keyframeCount - 1;
-
-  if(prop->keyframeCount == 1) return prop->keyframes[0].value;
-  if(time <= prop->keyframes[0].time) return prop->keyframes[0].value;
-  if(time >= prop->keyframes[last].time) return prop->keyframes[last].value;
-
-  for(uint8_t i = 0; i < last; i++) {
-    const keyframe_t *a = &prop->keyframes[i];
-    const keyframe_t *b = &prop->keyframes[i + 1];
-    if(time < a->time || time >= b->time) continue;
-    float_t t = (time - a->time) / (b->time - a->time);
-    t = easingApply(a->easing, t);
-    return a->value + (b->value - a->value) * t;
-  }
-
-  return prop->keyframes[last].value;
-}
\ No newline at end of file
diff --git a/src/dusk/animation/animationproperty.h b/src/dusk/animation/animationproperty.h
deleted file mode 100644
index f2be7fbe..00000000
--- a/src/dusk/animation/animationproperty.h
+++ /dev/null
@@ -1,45 +0,0 @@
-/**
- * Copyright (c) 2026 Dominic Masters
- * 
- * This software is released under the MIT License.
- * https://opensource.org/licenses/MIT
- */
-
-#pragma once
-#include "keyframe.h"
-
-#define ANIMATION_PROPERTY_KEYFRAME_COUNT_MAX 16
-
-typedef struct {
-  keyframe_t keyframes[ANIMATION_PROPERTY_KEYFRAME_COUNT_MAX];
-  uint8_t keyframeCount;
-  float_t *target;
-} animationproperty_t;
-
-/**
- * Appends a keyframe to a property. Keyframes must be added in ascending time
- * order. Updates the animation's duration.
- * 
- * @param property The property to add the keyframe to.
- * @param time The time of the keyframe, in seconds.
- * @param value The value of the keyframe.
- * @param easing The easing type to use when interpolating to the next keyframe.
- */
-void animationPropertyAddKeyframe(
-  animationproperty_t *property,
-  const float_t time,
-  const float_t value,
-  const easingtype_t easing
-);
-
-/**
- * Gets the property's value at a given time.
- * 
- * @param prop The property to get the value from.
- * @param time The time at which to get the value, in seconds.
- * @return The value of the property at the given time.
- */
-float_t animationPropertyGetValue(
-  const animationproperty_t *prop,
-  const float_t time
-);
\ No newline at end of file
diff --git a/src/dusk/animation/keyframe.h b/src/dusk/animation/keyframe.h
index 7543f647..6ea03984 100644
--- a/src/dusk/animation/keyframe.h
+++ b/src/dusk/animation/keyframe.h
@@ -10,4 +10,4 @@ typedef struct {
   float_t time;
   float_t value;
   easingtype_t easing;
-} keyframe_t;
+} keyframe_t;
\ No newline at end of file
diff --git a/src/dusk/event/event.c b/src/dusk/event/event.c
index a6b12977..c97d70c4 100644
--- a/src/dusk/event/event.c
+++ b/src/dusk/event/event.c
@@ -9,43 +9,53 @@
 #include "assert/assert.h"
 #include "util/memory.h"
 
-void eventInit(event_t *event) {
+void eventInit(event_t *event, eventcallback_t *callbacks, void **users, size_t size) {
   assertNotNull(event, "event must not be NULL");
-  memoryZero(event, sizeof(event_t));
+  assertNotNull((void *)callbacks, "callbacks must not be NULL");
+  assertTrue(size > 0, "size must be greater than 0");
+
+  event->callbacks = callbacks;
+  event->users = users;
+  event->size = size;
+  event->count = 0;
+  memoryZero(callbacks, sizeof(eventcallback_t) * size);
+  if(users) memoryZero(users, sizeof(void *) * size);
 }
 
 void eventSubscribe(event_t *event, eventcallback_t callback, void *user) {
   assertNotNull(event, "event must not be NULL");
-  assertNotNull((void *)callback, "callback must not be NULL");
+  assertNotNull(callback, "callback must not be NULL");
 
-  for(uint8_t i = 0; i < event->count; i++) {
-    if(event->callbacks[i] == callback && event->users[i] == user) return;
+  // Ensure callback isn't already susbcribed
+  for(uint32_t i = 0; i < event->count; i++) {
+    if(event->callbacks[i] != callback) continue;
+    assertUnreachable("Callback already registered, cannot subscribe twice.");
   }
 
-  assertTrue(
-    event->count < EVENT_SUBSCRIBER_COUNT_MAX,
-    "EVENT_SUBSCRIBER_COUNT_MAX exceeded"
-  );
+  assertTrue(event->count < event->size, "event subscriber capacity exceeded");
 
   event->callbacks[event->count] = callback;
-  event->users[event->count] = user;
+  if(user) {
+    assertNotNull(event->users, "Cannot add user pointer.");
+    event->users[event->count] = user;
+  }
   event->count++;
 }
 
-void eventUnsubscribe(event_t *event, eventcallback_t callback, void *user) {
+void eventUnsubscribe(event_t *event, eventcallback_t callback) {
   assertNotNull(event, "event must not be NULL");
-  assertNotNull((void *)callback, "callback must not be NULL");
+  assertNotNull(callback, "callback must not be NULL");
 
-  for(uint8_t i = 0; i < event->count; i++) {
-    if(event->callbacks[i] != callback || event->users[i] != user) continue;
+  for(uint32_t i = 0; i < event->count; i++) {
+    if(event->callbacks[i] != callback) continue;
 
-    uint8_t last = event->count - 1;
+    uint32_t last = event->count - 1;
     if(i != last) {
       event->callbacks[i] = event->callbacks[last];
-      event->users[i] = event->users[last];
+      if(event->users) event->users[i] = event->users[last];
     }
     event->callbacks[last] = NULL;
-    event->users[last] = NULL;
+    if(event->users) event->users[last] = NULL;
     event->count--;
     return;
   }
@@ -53,7 +63,9 @@ void eventUnsubscribe(event_t *event, eventcallback_t callback, void *user) {
 
 void eventInvoke(const event_t *event, void *params) {
   assertNotNull(event, "event must not be NULL");
-  for(uint8_t i = 0; i < event->count; i++) {
-    event->callbacks[i](params, event->users[i]);
+
+  for(uint32_t i = 0; i < event->count; i++) {
+    void *u = event->users ? event->users[i] : NULL;
+    event->callbacks[i](params, u);
   }
 }
diff --git a/src/dusk/event/event.h b/src/dusk/event/event.h
index 340ad3d1..b94b3f59 100644
--- a/src/dusk/event/event.h
+++ b/src/dusk/event/event.h
@@ -8,31 +8,40 @@
 #pragma once
 #include "dusk.h"
 
-#define EVENT_SUBSCRIBER_COUNT_MAX 8
-
 typedef void (*eventcallback_t)(void *params, void *user);
 
 typedef struct {
-  eventcallback_t callbacks[EVENT_SUBSCRIBER_COUNT_MAX];
-  void *users[EVENT_SUBSCRIBER_COUNT_MAX];
-  uint8_t count;
+  eventcallback_t *callbacks;
+  void **users;
+  size_t size;
+  uint32_t count;
 } event_t;
 
 /**
- * Initializes an event, clearing all subscribers.
+ * Initializes an event, binding it to the provided backing arrays and clearing
+ * all subscribers. May also be called to reset an event (re-clears subscribers
+ * without changing the backing arrays or size).
  *
  * @param event The event to initialize.
+ * @param callbacks Caller-owned array of at least `size` callback slots.
+ * @param users Array of user pointers, matching each callback, or NULL.
+ * @param size Capacity of both arrays, must match.
  */
-void eventInit(event_t *event);
+void eventInit(
+  event_t *event,
+  eventcallback_t *callbacks,
+  void **users,
+  size_t size
+);
 
 /**
  * Subscribes a callback to an event. The callback is invoked with params and
  * the provided user pointer each time the event fires. The same (callback,
  * user) pair may only be subscribed once.
  *
- * @param event    The event to subscribe to.
+ * @param event The event to subscribe to.
  * @param callback The function to call when the event fires.
- * @param user     Arbitrary pointer forwarded to the callback unchanged.
+ * @param user Arbitrary pointer forwarded to the callback unchanged.
  */
 void eventSubscribe(event_t *event, eventcallback_t callback, void *user);
 
@@ -40,17 +49,16 @@ void eventSubscribe(event_t *event, eventcallback_t callback, void *user);
  * Removes a previously subscribed (callback, user) pair. Does nothing if the
  * pair is not currently subscribed.
  *
- * @param event    The event to unsubscribe from.
+ * @param event The event to unsubscribe from.
  * @param callback The callback that was passed to eventSubscribe.
- * @param user     The user pointer that was passed to eventSubscribe.
  */
-void eventUnsubscribe(event_t *event, eventcallback_t callback, void *user);
+void eventUnsubscribe(event_t *event, eventcallback_t callback);
 
 /**
  * Invokes all subscribed callbacks, passing params and each subscriber's user
  * pointer.
  *
- * @param event  The event to invoke.
+ * @param event The event to invoke.
  * @param params Arbitrary pointer forwarded to every callback unchanged.
  */
 void eventInvoke(const event_t *event, void *params);
diff --git a/src/dusk/input/input.c b/src/dusk/input/input.c
index d0854638..70cf416a 100644
--- a/src/dusk/input/input.c
+++ b/src/dusk/input/input.c
@@ -22,8 +22,8 @@ errorret_t inputInit(void) {
     INPUT.actions[i].action = (inputaction_t)i;
     INPUT.actions[i].lastValue = 0.0f;
     INPUT.actions[i].currentValue = 0.0f;
-    eventInit(&INPUT.actions[i].onPressed);
-    eventInit(&INPUT.actions[i].onReleased);
+    eventInit(&INPUT.actions[i].onPressed, INPUT.actions[i].onPressedCallbacks, INPUT.actions[i].onPressedUsers, 4);
+    eventInit(&INPUT.actions[i].onReleased, INPUT.actions[i].onReleasedCallbacks, INPUT.actions[i].onReleasedUsers, 4);
   }
 
   #ifdef inputInitPlatform
diff --git a/src/dusk/input/inputaction.h b/src/dusk/input/inputaction.h
index 867f3ace..22fd68fe 100644
--- a/src/dusk/input/inputaction.h
+++ b/src/dusk/input/inputaction.h
@@ -20,7 +20,11 @@ typedef struct {
     float_t currentDynamicValue;
   #endif
 
+  eventcallback_t onPressedCallbacks[4];
+  void *onPressedUsers[4];
   event_t onPressed;
+  eventcallback_t onReleasedCallbacks[4];
+  void *onReleasedUsers[4];
   event_t onReleased;
 } inputactiondata_t;
 
diff --git a/src/dusk/ui/uifullbox.c b/src/dusk/ui/uifullbox.c
index c4f85268..e54af74c 100644
--- a/src/dusk/ui/uifullbox.c
+++ b/src/dusk/ui/uifullbox.c
@@ -19,7 +19,7 @@ uifullbox_t UI_FULLBOX_OVER;
 void uiFullboxInit(uifullbox_t *fullbox) {
   assertNotNull(fullbox, "fullbox must not be NULL");
   memoryZero(fullbox, sizeof(uifullbox_t));
-  eventInit(&fullbox->onTransitionEnd);
+  eventInit(&fullbox->onTransitionEnd, fullbox->onTransitionEndCallbacks, fullbox->onTransitionEndUsers, 4);
 }
 
 void uiFullboxUpdate(uifullbox_t *fullbox, float_t delta) {
diff --git a/src/dusk/ui/uifullbox.h b/src/dusk/ui/uifullbox.h
index e5e3d476..c1f172cc 100644
--- a/src/dusk/ui/uifullbox.h
+++ b/src/dusk/ui/uifullbox.h
@@ -17,6 +17,8 @@ typedef struct {
   float_t duration;
   float_t time;
   easingtype_t easing;
+  eventcallback_t onTransitionEndCallbacks[4];
+  void *onTransitionEndUsers[4];
   event_t onTransitionEnd;
 } uifullbox_t;
 
diff --git a/src/dusk/ui/uiloading.c b/src/dusk/ui/uiloading.c
index 3b6de794..25bcebc3 100644
--- a/src/dusk/ui/uiloading.c
+++ b/src/dusk/ui/uiloading.c
@@ -19,7 +19,7 @@ uiloading_t UI_LOADING;
 
 void uiLoadingInit(void) {
   memoryZero(&UI_LOADING, sizeof(uiloading_t));
-  eventInit(&UI_LOADING.onTransitionEnd);
+  eventInit(&UI_LOADING.onTransitionEnd, UI_LOADING.onTransitionEndCallbacks, UI_LOADING.onTransitionEndUsers, 4);
 }
 
 void uiLoadingUpdate(float_t delta) {
@@ -65,7 +65,7 @@ static void uiLoadingTransition(
   UI_LOADING.toAlpha = to;
   UI_LOADING.duration = UI_LOADING_FADE_DURATION;
   UI_LOADING.time = 0.0f;
-  eventInit(&UI_LOADING.onTransitionEnd);
+  eventInit(&UI_LOADING.onTransitionEnd, UI_LOADING.onTransitionEndCallbacks, UI_LOADING.onTransitionEndUsers, 4);
   if(callback) eventSubscribe(&UI_LOADING.onTransitionEnd, callback, user);
 }
 
diff --git a/src/dusk/ui/uiloading.h b/src/dusk/ui/uiloading.h
index 49f54548..60bf9414 100644
--- a/src/dusk/ui/uiloading.h
+++ b/src/dusk/ui/uiloading.h
@@ -17,6 +17,8 @@ typedef struct {
   float_t toAlpha;
   float_t duration;
   float_t time;
+  eventcallback_t onTransitionEndCallbacks[4];
+  void *onTransitionEndUsers[4];
   event_t onTransitionEnd;
 } uiloading_t;
 
diff --git a/src/dusk/ui/uitextbox.c b/src/dusk/ui/uitextbox.c
index f9746b30..6c0c0c17 100644
--- a/src/dusk/ui/uitextbox.c
+++ b/src/dusk/ui/uitextbox.c
@@ -46,8 +46,8 @@ errorret_t uiTextboxInit(void) {
   UI_TEXTBOX.frame.tileset.uv[1] = 1.0f / 3.0f;
   UI_TEXTBOX.frame.texture = &TEXTURE_WHITE;
 
-  eventInit(&UI_TEXTBOX.onPageComplete);
-  eventInit(&UI_TEXTBOX.onLastPage);
+  eventInit(&UI_TEXTBOX.onPageComplete, UI_TEXTBOX.onPageCompleteCallbacks, UI_TEXTBOX.onPageCompleteUsers, 4);
+  eventInit(&UI_TEXTBOX.onLastPage, UI_TEXTBOX.onLastPageCallbacks, UI_TEXTBOX.onLastPageUsers, 4);
 
   errorOk();
 }
diff --git a/src/dusk/ui/uitextbox.h b/src/dusk/ui/uitextbox.h
index 033e8415..51e73d68 100644
--- a/src/dusk/ui/uitextbox.h
+++ b/src/dusk/ui/uitextbox.h
@@ -42,7 +42,11 @@ typedef struct {
   int32_t scroll;
   inputaction_t advanceAction;
 
+  eventcallback_t onPageCompleteCallbacks[4];
+  void *onPageCompleteUsers[4];
   event_t onPageComplete;
+  eventcallback_t onLastPageCallbacks[4];
+  void *onLastPageUsers[4];
   event_t onLastPage;
 } uitextbox_t;
 
diff --git a/src/dusk/util/math.c b/src/dusk/util/math.c
index 9f0caa3e..40eecf9f 100644
--- a/src/dusk/util/math.c
+++ b/src/dusk/util/math.c
@@ -24,4 +24,8 @@ float_t mathModFloat(float_t x, float_t y) {
   float_t result = fmodf(x, y);
   if(result < 0) result += y;
   return result;
+}
+
+float_t mathLerp(float_t a, float_t b, float_t t) {
+  return a + t * (b - a);
 }
\ No newline at end of file
diff --git a/src/dusk/util/math.h b/src/dusk/util/math.h
index d27981bf..ab8cf45e 100644
--- a/src/dusk/util/math.h
+++ b/src/dusk/util/math.h
@@ -60,4 +60,14 @@ uint32_t mathNextPowTwo(uint32_t value);
  * @param y The divisor.
  * @return The result of the modulus operation.
  */
-float_t mathModFloat(float_t x, float_t y);
\ No newline at end of file
+float_t mathModFloat(float_t x, float_t y);
+
+/**
+ * Linearly interpolates between two values.
+ * 
+ * @param a The start value.
+ * @param b The end value.
+ * @param t The interpolation factor, between 0 and 1.
+ * @return The interpolated value.
+ */
+float_t mathLerp(float_t a, float_t b, float_t t);
\ No newline at end of file