diff --git a/src/display/scene/overworld/sceneoverworld.c b/src/display/scene/overworld/sceneoverworld.c
index ad46cf7..ed37077 100644
--- a/src/display/scene/overworld/sceneoverworld.c
+++ b/src/display/scene/overworld/sceneoverworld.c
@@ -37,6 +37,17 @@ errorret_t sceneOverworldInit(void) {
 }
 
 void sceneOverworldUpdate(void) {
+  // Move camera to player.
+  const entity_t *start = &testMap.entities[0];
+  const entity_t *end = &testMap.entities[testMap.entityCount];
+  while(start < end) {
+    if(start->type == ENTITY_TYPE_PLAYER) {
+      SCENE_OVERWORLD.camera.lookat.target[0] = start->position[0];
+      SCENE_OVERWORLD.camera.lookat.target[1] = start->position[1];
+      break;
+    }
+    start++;
+  }
 }
 
 void sceneOverworldRender(void) {
@@ -69,6 +80,7 @@ void sceneOverworldRenderMap(const map_t *map) {
   assertNotNull(map, "Map pointer cannot be NULL");
 
   // Draw base layer
+  sceneOverworldRenderMapLayer(map, &map->base);
   
   // Draw entities
   const entity_t *start = &map->entities[0];
@@ -78,8 +90,10 @@ void sceneOverworldRenderMap(const map_t *map) {
     sceneOverworldRenderEntity(start);
     start++;
   }
+  spriteBatchFlush();
 
   // Draw overlay layer.
+  sceneOverworldRenderMapLayer(map, &map->overlay);
 }
 
 void sceneOverworldRenderEntity(const entity_t *entity) {
@@ -88,7 +102,7 @@ void sceneOverworldRenderEntity(const entity_t *entity) {
   assertTrue(entity->type != ENTITY_TYPE_NULL, "Cannot have NULL entity type");
 
   vec4 uv;
-  tilesetTileGetUV(&TILESET_ENTITIES, 0, uv);
+  tilesetPositionGetUV(&TILESET_ENTITIES, entity->direction, 0, uv);
 
   // For now, just draw a placeholder quad.
   spriteBatchPush(
@@ -101,7 +115,30 @@ void sceneOverworldRenderEntity(const entity_t *entity) {
   );
 }
 
+void sceneOverworldRenderMapLayer(const map_t *map, const maplayer_t *layer) {
+  assertNotNull(layer, "Map layer pointer cannot be NULL");
+
+  for(uint32_t y = 0; y < map->height; y++) {
+    for(uint32_t x = 0; x < map->width; x++) {
+      const tile_t *tile = &layer->tiles[y * map->width + x];
+      if(tile->id == 0) continue;
+
+      spriteBatchPush(
+        NULL,
+        x * TILESET_ENTITIES.tileWidth,
+        y * TILESET_ENTITIES.tileHeight,
+        (x + 1) * TILESET_ENTITIES.tileWidth,
+        (y + 1) * TILESET_ENTITIES.tileHeight,
+        COLOR_RED,
+        0, 0, 1, 1
+      );
+    }
+  }
+
+  spriteBatchFlush();
+}
+
 void sceneOverworldDispose(void) {
   // Dispose of the overworld scene.
   if(testAsset) assetUnlock(testAsset, testAssetRef);
-}
+}
\ No newline at end of file
diff --git a/src/display/scene/overworld/sceneoverworld.h b/src/display/scene/overworld/sceneoverworld.h
index c5aa8b2..a1a948b 100644
--- a/src/display/scene/overworld/sceneoverworld.h
+++ b/src/display/scene/overworld/sceneoverworld.h
@@ -45,6 +45,14 @@ void sceneOverworldRenderMap(const map_t *map);
  */
 void sceneOverworldRenderEntity(const entity_t *entity);
 
+/**
+ * Render a map layer in the overworld scene.
+ * 
+ * @param map Pointer to the map the layer belongs to.
+ * @param layer Pointer to the map layer to render.
+ */
+void sceneOverworldRenderMapLayer(const map_t *map, const maplayer_t *layer);
+
 /**
  * Dispose of the overworld scene.
  */
diff --git a/src/physics/CMakeLists.txt b/src/physics/CMakeLists.txt
index c8326d0..525b700 100644
--- a/src/physics/CMakeLists.txt
+++ b/src/physics/CMakeLists.txt
@@ -7,4 +7,5 @@
 target_sources(${DUSK_TARGET_NAME}
   PRIVATE
     physicscircle.c
+    physicsbox.c
 )
\ No newline at end of file
diff --git a/src/physics/physics.h b/src/physics/physics.h
index 601f1fa..c347539 100644
--- a/src/physics/physics.h
+++ b/src/physics/physics.h
@@ -6,4 +6,5 @@
  */
 
 #pragma once
-#include "physicscircle.h"
\ No newline at end of file
+#include "physicscircle.h"
+#include "physicsbox.h"
\ No newline at end of file
diff --git a/src/physics/physicsbox.c b/src/physics/physicsbox.c
new file mode 100644
index 0000000..6259a5f
--- /dev/null
+++ b/src/physics/physicsbox.c
@@ -0,0 +1,47 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "physicsbox.h"
+
+void physicsBoxCheckBox(
+  const physicsbox_t a,
+  const physicsbox_t b,
+  physicsboxboxresult_t *out
+) {
+  float_t dx = (b.min[0] + b.max[0]) / 2.0f - (a.min[0] + a.max[0]) / 2.0f;
+  float_t dy = (b.min[1] + b.max[1]) / 2.0f - (a.min[1] + a.max[1]) / 2.0f;
+  float_t combinedHalfWidths = (a.max[0] - a.min[0]) / 2.0f + (b.max[0] - b.min[0]) / 2.0f;
+  float_t combinedHalfHeights = (a.max[1] - a.min[1]) / 2.0f + (b.max[1] - b.min[1]) / 2.0f;
+
+  if (fabsf(dx) < combinedHalfWidths && fabsf(dy) < combinedHalfHeights) {
+    out->hit = true;
+    float_t overlapX = combinedHalfWidths - fabsf(dx);
+    float_t overlapY = combinedHalfHeights - fabsf(dy);
+
+    if (overlapX < overlapY) {
+      if (dx > 0) {
+        out->normal[0] = 1.0f;
+        out->normal[1] = 0.0f;
+      } else {
+        out->normal[0] = -1.0f;
+        out->normal[1] = 0.0f;
+      }
+      out->depth = overlapX;
+    } else {
+      if (dy > 0) {
+        out->normal[0] = 0.0f;
+        out->normal[1] = 1.0f;
+      } else {
+        out->normal[0] = 0.0f;
+        out->normal[1] = -1.0f;
+      }
+      out->depth = overlapY;
+    }
+  } else {
+    out->hit = false;
+  }
+}
\ No newline at end of file
diff --git a/src/physics/physicsbox.h b/src/physics/physicsbox.h
new file mode 100644
index 0000000..0c378a7
--- /dev/null
+++ b/src/physics/physicsbox.h
@@ -0,0 +1,33 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "dusk.h"
+
+typedef struct physicsbox_s {
+  vec2 min;
+  vec2 max;
+} physicsbox_t;
+
+typedef struct physicsboxboxresult_s {
+  bool_t hit;
+  vec2 normal;
+  float_t depth;
+} physicsboxboxresult_t;
+
+/**
+ * Check for collision between two boxes.
+ * 
+ * @param a The first box.
+ * @param b The second box.
+ * @param out Pointer to the result structure to populate.
+ */
+void physicsBoxCheckBox(
+  const physicsbox_t a,
+  const physicsbox_t b,
+  physicsboxboxresult_t *out
+);
\ No newline at end of file
diff --git a/src/rpg/entity/CMakeLists.txt b/src/rpg/entity/CMakeLists.txt
index fd5a1e3..f1edcfd 100644
--- a/src/rpg/entity/CMakeLists.txt
+++ b/src/rpg/entity/CMakeLists.txt
@@ -9,4 +9,5 @@ target_sources(${DUSK_TARGET_NAME}
     entity.c
     npc.c
     player.c
+    direction.c
 )
\ No newline at end of file
diff --git a/src/rpg/entity/direction.c b/src/rpg/entity/direction.c
new file mode 100644
index 0000000..e4f0e5e
--- /dev/null
+++ b/src/rpg/entity/direction.c
@@ -0,0 +1,53 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "direction.h"
+#include "assert/assert.h"
+
+float_t directionToAngle(const direction_t dir) {
+  switch(dir) {
+    case DIRECTION_NORTH: return (M_PI_2);
+    case DIRECTION_SOUTH: return -(M_PI_2);
+    case DIRECTION_EAST: return 0;
+    case DIRECTION_WEST: return (M_PI);
+    default: return 0; // Should never happen
+  }
+}
+
+void directionGetCoordinates(
+  const direction_t dir,
+  int8_t *x, int8_t *y
+) {
+  assertNotNull(x, "X coordinate pointer cannot be NULL");
+  assertNotNull(y, "Y coordinate pointer cannot be NULL");
+
+  switch(dir) {
+    case DIRECTION_NORTH:
+      *x = 0;
+      *y = -1;
+      break;
+
+    case DIRECTION_SOUTH:
+      *x = 0;
+      *y = 1;
+      break;
+
+    case DIRECTION_EAST:
+      *x = 1;
+      *y = 0;
+      break;
+
+    case DIRECTION_WEST:
+      *x = -1;
+      *y = 0;
+      break;
+
+    default:
+      assertUnreachable("Invalid direction");
+      break;
+  }
+}
\ No newline at end of file
diff --git a/src/rpg/entity/direction.h b/src/rpg/entity/direction.h
new file mode 100644
index 0000000..65d6f2e
--- /dev/null
+++ b/src/rpg/entity/direction.h
@@ -0,0 +1,41 @@
+/**
+ * Copyright (c) 2025 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "dusk.h"
+
+typedef enum {
+  DIRECTION_SOUTH = 0,
+  DIRECTION_EAST = 1,
+  DIRECTION_WEST = 2,
+  DIRECTION_NORTH = 3,
+
+  DIRECTION_UP = DIRECTION_NORTH,
+  DIRECTION_DOWN = DIRECTION_SOUTH,
+  DIRECTION_LEFT = DIRECTION_WEST,
+  DIRECTION_RIGHT = DIRECTION_EAST,
+} direction_t;
+
+/**
+ * Converts a direction to an angle in float_t format.
+ * 
+ * @param dir The direction to convert.
+ * @return The angle corresponding to the direction.
+ */
+float_t directionToAngle(const direction_t dir);
+
+/**
+ * Gets the relative coordinates for a given direction.
+ * 
+ * @param dir The direction to get coordinates for.
+ * @param x Pointer to store the x coordinate.
+ * @param y Pointer to store the y coordinate.
+ */
+void directionGetCoordinates(
+  const direction_t dir,
+  int8_t *x, int8_t *y
+);
\ No newline at end of file
diff --git a/src/rpg/entity/entity.c b/src/rpg/entity/entity.c
index 56c8815..6a65885 100644
--- a/src/rpg/entity/entity.c
+++ b/src/rpg/entity/entity.c
@@ -6,33 +6,98 @@
  */
 
 #include "entity.h"
+#include "rpg/world/map.h"
 #include "assert/assert.h"
 #include "util/memory.h"
 #include "display/tileset/tileset_entities.h"
+#include "time/time.h"
+#include "util/math.h"
 
-entitycallback_t ENTITY_CALLBACKS[ENTITY_TYPE_COUNT] = {
-  { NULL, NULL }, // ENTITY_TYPE_NULL
-  { playerInit, playerUpdate }, // ENTITY_TYPE_PLAYER
-  { npcInit, npcUpdate}, // ENTITY_TYPE_NPC
-};
-
-void entityInit(entity_t *entity, const entitytype_t type) {
+void entityInit(entity_t *entity, const entitytype_t type, map_t *map) {
   assertNotNull(entity, "Entity pointer cannot be NULL");
+  assertNotNull(map, "Map pointer cannot be NULL");
   assertTrue(type < ENTITY_TYPE_COUNT, "Invalid entity type");
   assertTrue(type != ENTITY_TYPE_NULL, "Cannot have NULL entity type");
-  assertNotNull(ENTITY_CALLBACKS[type].init, "Entity type has no init function");
 
   memoryZero(entity, sizeof(entity_t));
   entity->type = type;
+  entity->map = map;
 
-  ENTITY_CALLBACKS[type].init(entity);
+  // Init. I did use a callback struct but it was not flexible enough.
+  switch(type) {
+    case ENTITY_TYPE_PLAYER:
+      playerInit(entity);
+      break;
+
+    case ENTITY_TYPE_NPC:
+      npcInit(entity);
+      break;
+
+    default:
+      break;
+  }
 }
 
 void entityUpdate(entity_t *entity) {
   assertNotNull(entity, "Entity pointer cannot be NULL");
   assertTrue(entity->type < ENTITY_TYPE_COUNT, "Invalid entity type");
   assertTrue(entity->type != ENTITY_TYPE_NULL, "Cannot have NULL entity type");
-  assertNotNull(ENTITY_CALLBACKS[entity->type].update, "enttype lacks update");
 
-  ENTITY_CALLBACKS[entity->type].update(entity);
+  // Handle movement logic
+  switch(entity->type) {
+    case ENTITY_TYPE_PLAYER:
+      playerMovement(entity);
+      break;
+
+    case ENTITY_TYPE_NPC:
+      npcUpdate(entity);
+      break;
+
+    default:
+      break;
+  }
+
+  // Apply velocity
+  if(entity->velocity[0] != 0.0f || entity->velocity[1] != 0.0f) {
+    entity->position[0] += entity->velocity[0] * TIME.delta;
+    entity->position[1] += entity->velocity[1] * TIME.delta;
+
+    // Hit test on other entities.
+    entity_t *start = entity->map->entities;
+    entity_t *end = &entity->map->entities[entity->map->entityCount];
+
+    // Our hitbox
+    physicscircle_t self;
+    glm_vec2_copy(entity->position, self.position);
+    self.radius = TILESET_ENTITIES.tileWidth / 2.0f;
+
+    physicscircle_t other;
+    other.radius = self.radius;
+
+    // TODO: what if multiple collisions?
+    do {
+      if(start == entity) continue;
+      if(start->type == ENTITY_TYPE_NULL) continue;
+      glm_vec2_copy(start->position, other.position);
+
+      physicscirclecircleresult_t result;
+      physicsCircleCheckCircle(self, other, &result);
+
+      if(result.hit) {
+        entity->position[0] -= result.normal[0] * result.depth;
+        entity->position[1] -= result.normal[1] * result.depth;
+        break;
+      }
+    } while((start++) != end);
+
+    // Friction (and dampening)
+    entity->velocity[0] *= ENTITY_FRICTION * TIME.delta;
+    entity->velocity[1] *= ENTITY_FRICTION * TIME.delta;
+    if(mathAbs(entity->velocity[0]) < ENTITY_MIN_VELOCITY) {
+      entity->velocity[0] = 0.0f;
+    }
+    if(mathAbs(entity->velocity[1]) < ENTITY_MIN_VELOCITY) {
+      entity->velocity[1] = 0.0f;
+    }
+  }
 }
\ No newline at end of file
diff --git a/src/rpg/entity/entity.h b/src/rpg/entity/entity.h
index 7b96dea..0015c48 100644
--- a/src/rpg/entity/entity.h
+++ b/src/rpg/entity/entity.h
@@ -6,15 +6,15 @@
  */
 
 #pragma once
-// #include "direction.h"
+#include "direction.h"
 #include "rpg/entity/player.h"
 #include "npc.h"
 #include "physics/physics.h"
 
-typedef struct {
-  void (*init)(entity_t *entity);
-  void (*update)(entity_t *entity);
-} entitycallback_t;
+#define ENTITY_FRICTION 0.9f
+#define ENTITY_MIN_VELOCITY 0.05f
+
+typedef struct map_s map_t;
 
 typedef enum {
   ENTITY_TYPE_NULL,
@@ -25,9 +25,9 @@ typedef enum {
 } entitytype_t;
 
 typedef struct entity_s {
-  // uint32_t id;// Completely unique ID for this entity.
+  map_t *map;
   entitytype_t type;
-  // direction_t dir;
+  direction_t direction;
 
   vec2 position;
   vec2 velocity;
@@ -38,15 +38,14 @@ typedef struct entity_s {
   };
 } entity_t;
 
-extern entitycallback_t ENTITY_CALLBACKS[ENTITY_TYPE_COUNT];
-
 /**
  * Initializes an entity structure.
  * 
  * @param entity Pointer to the entity structure to initialize.
  * @param type The type of the entity.
+ * @param map Pointer to the map the entity belongs to.
  */
-void entityInit(entity_t *entity, const entitytype_t type);
+void entityInit(entity_t *entity, const entitytype_t type, map_t *map);
 
 /**
  * Updates an entity.
diff --git a/src/rpg/entity/player.c b/src/rpg/entity/player.c
index 90a7f66..63257b0 100644
--- a/src/rpg/entity/player.c
+++ b/src/rpg/entity/player.c
@@ -7,9 +7,7 @@
 
 #include "entity.h"
 #include "assert/assert.h"
-#include "time/time.h"
 #include "input/input.h"
-
 #include "display/scene/overworld/sceneoverworld.h"
 #include "display/tileset/tileset_entities.h"
 
@@ -17,36 +15,48 @@ void playerInit(entity_t *entity) {
   assertNotNull(entity, "Entity pointer cannot be NULL");
 }
 
-void playerUpdate(entity_t *entity) {
+void playerMovement(entity_t *entity) {
   assertNotNull(entity, "Entity pointer cannot be NULL");
 
-  // testing only
-  float_t move = TIME.delta * 64.0f; // tiles per second
+  // Update velocity.
   vec2 dir = {
     inputAxis(INPUT_ACTION_LEFT, INPUT_ACTION_RIGHT),
-    inputAxis(INPUT_ACTION_UP, INPUT_ACTION_DOWN)
+    inputAxis(INPUT_ACTION_DOWN, INPUT_ACTION_UP)
   };
+  if(dir[0] == 0 && dir[1] == 0) return;
+
   glm_vec2_normalize(dir);
-  entity->position[0] += move * dir[0];
-  entity->position[1] -= move * dir[1];
-
-  SCENE_OVERWORLD.camera.lookat.target[0] = entity->position[0];
-  SCENE_OVERWORLD.camera.lookat.target[1] = entity->position[1];
-
-  // Can we move?
-  physicscircle_t npc = {
-    .position = { 32.0f, 32.0f },
-    .radius = TILESET_ENTITIES.tileWidth / 2.0f
-  };
-
-  physicscircle_t self;
-  glm_vec2_copy(entity->position, self.position);
-  self.radius = npc.radius;
-
-  physicscirclecircleresult_t result;
-  physicsCircleCheckCircle(self, npc, &result);
-  if(result.hit) {
-    entity->position[0] -= result.normal[0] * result.depth;
-    entity->position[1] -= result.normal[1] * result.depth;
+  entity->velocity[0] += PLAYER_SPEED * dir[0];
+  entity->velocity[1] += PLAYER_SPEED * dir[1];
+  
+  // Update direction.
+  if(dir[0] > 0) {
+    if(entity->direction == DIRECTION_RIGHT) {
+      entity->direction = DIRECTION_RIGHT;
+    } else {
+      if(dir[1] < 0) {
+        entity->direction = DIRECTION_UP;
+      } else if(dir[1] > 0) {
+        entity->direction = DIRECTION_DOWN;
+      } else {
+        entity->direction = DIRECTION_RIGHT;
+      }
+    }
+  } else if(dir[0] < 0) {
+    if(entity->direction == DIRECTION_LEFT) {
+      entity->direction = DIRECTION_LEFT;
+    } else {
+      if(dir[1] < 0) {
+        entity->direction = DIRECTION_UP;
+      } else if(dir[1] > 0) {
+        entity->direction = DIRECTION_DOWN;
+      } else {
+        entity->direction = DIRECTION_LEFT;
+      }
+    }
+  } else if(dir[1] < 0) {
+    entity->direction = DIRECTION_UP;
+  } else if(dir[1] > 0) {
+    entity->direction = DIRECTION_DOWN;
   }
 }
\ No newline at end of file
diff --git a/src/rpg/entity/player.h b/src/rpg/entity/player.h
index d0018a5..ea88ef6 100644
--- a/src/rpg/entity/player.h
+++ b/src/rpg/entity/player.h
@@ -8,6 +8,8 @@
 #pragma once
 #include "dusk.h"
 
+#define PLAYER_SPEED 64.0f
+
 typedef struct entity_s entity_t;
 
 typedef struct {
@@ -22,8 +24,8 @@ typedef struct {
 void playerInit(entity_t *entity);
 
 /**
- * Updates a player entity.
+ * Handles movement logic for the player entity.
  * 
- * @param entity Pointer to the entity structure to update.
+ * @param entity Pointer to the player entity structure.
  */
-void playerUpdate(entity_t *entity);
\ No newline at end of file
+void playerMovement(entity_t *entity);
\ No newline at end of file
diff --git a/src/rpg/rpg.c b/src/rpg/rpg.c
index df75aee..32b1f4e 100644
--- a/src/rpg/rpg.c
+++ b/src/rpg/rpg.c
@@ -13,12 +13,17 @@ map_t testMap;
 
 void rpgInit() {
   mapInit(&testMap);
+  testMap.width = 2;
+  testMap.height = 2;
+  for(uint32_t i = 0; i < testMap.width * testMap.height; i++) {
+    testMap.base.tiles[i].id = 1;
+  }
 
   entity_t *ent = mapEntityAdd(&testMap);
-  entityInit(ent, ENTITY_TYPE_PLAYER);
+  entityInit(ent, ENTITY_TYPE_PLAYER, &testMap);
 
   entity_t *npc = mapEntityAdd(&testMap);
-  entityInit(npc, ENTITY_TYPE_NPC);
+  entityInit(npc, ENTITY_TYPE_NPC, &testMap);
   npc->position[0] = 32.0f;
   npc->position[1] = 32.0f;
 }
diff --git a/src/rpg/world/map.h b/src/rpg/world/map.h
index c01be2b..fce231d 100644
--- a/src/rpg/world/map.h
+++ b/src/rpg/world/map.h
@@ -22,7 +22,7 @@ typedef struct {
   tile_t tiles[MAP_TILE_COUNT_MAX];
 } maplayer_t;
 
-typedef struct {
+typedef struct map_s {
   entity_t entities[MAP_ENTITY_COUNT_MAX];
   uint8_t entityCount;
 
diff --git a/src/util/math.h b/src/util/math.h
index 5884113..3e93b98 100644
--- a/src/util/math.h
+++ b/src/util/math.h
@@ -42,4 +42,12 @@ uint32_t mathNextPowTwo(uint32_t value);
  * @param upper The upper bound.
  * @return The clamped value.
  */
-#define mathClamp(x, lower, upper) (mathMin(upper, mathMax(lower, x)))
\ No newline at end of file
+#define mathClamp(x, lower, upper) (mathMin(upper, mathMax(lower, x)))
+
+/**
+ * Returns the absolute value of a number.
+ * 
+ * @param amt The number to get the absolute value of.
+ * @return The absolute value of the number.
+ */
+#define mathAbs(amt) ((amt) < 0 ? -(amt) : (amt))
\ No newline at end of file