diff --git a/CMakeLists.txt b/CMakeLists.txt
index f7b2911..1935920 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -13,6 +13,7 @@ set(SOURCES
 	src/input.c
 	src/player.c
 	src/level.c
+	src/background.c
 )
 
 set(ASSETS
diff --git a/inc/background.h b/inc/background.h
new file mode 100644
index 0000000..e2f3f37
--- /dev/null
+++ b/inc/background.h
@@ -0,0 +1,5 @@
+#pragma once
+
+void background_init(void);
+void background_update(void);
+void background_draw(void);
diff --git a/inc/level.h b/inc/level.h
index e944080..f3ddbea 100644
--- a/inc/level.h
+++ b/inc/level.h
@@ -2,5 +2,9 @@
 
 void level_deinit(void);
 void level_load(int id);
+void level_next(void);
+void level_reload(void);
 void level_find(int tile, int *x, int *y);
 void level_draw(void);
+int level_at(int x, int y);
+int level_id(void);
diff --git a/inc/player.h b/inc/player.h
index d0fa202..981ad7b 100644
--- a/inc/player.h
+++ b/inc/player.h
@@ -6,3 +6,7 @@ void player_draw(void);
 
 #define PLAYER_WIDTH  12
 #define PLAYER_HEIGHT 12
+#define PLAYER_SPEED  2
+#define GRAVITY       0.69
+#define MAX_Y_SPEED   5
+#define JUMP_SPEED    -6
diff --git a/res/0.kble b/res/0.kble
index d1ba8be..4ef65ff 100644
Binary files a/res/0.kble and b/res/0.kble differ
diff --git a/res/1.kble b/res/1.kble
new file mode 100644
index 0000000..e45a544
Binary files /dev/null and b/res/1.kble differ
diff --git a/res/2.kble b/res/2.kble
new file mode 100644
index 0000000..8431816
Binary files /dev/null and b/res/2.kble differ
diff --git a/res/3.kble b/res/3.kble
new file mode 100644
index 0000000..c45afae
Binary files /dev/null and b/res/3.kble differ
diff --git a/res/fxconv-metadata.txt b/res/fxconv-metadata.txt
index 327e8ab..8f9d068 100644
--- a/res/fxconv-metadata.txt
+++ b/res/fxconv-metadata.txt
@@ -1,7 +1,7 @@
 tset.png:
   type: bopti-image
   name: bimg_tset
-  profile: p4
+  profile: p8
 font.png:
   type: bopti-image
   name: bimg_font
diff --git a/res/tset.png b/res/tset.png
index b1920b6..e82fb2a 100644
Binary files a/res/tset.png and b/res/tset.png differ
diff --git a/src/background.c b/src/background.c
new file mode 100644
index 0000000..fa0b482
--- /dev/null
+++ b/src/background.c
@@ -0,0 +1,16 @@
+#include "conf.h"
+#include "level.h"
+#include "lzy.h"
+
+void background_init(void) {}
+
+void background_update(void) {}
+
+void background_draw(void)
+{
+	const int id = TSET_LINE + level_id() * TSET_LINE * 7;
+	LZY_DrawTileEx(id, 0, 0, 13, 7);
+	LZY_DrawTileEx(id, 0, DISPLAY_HEIGHT / 2, 13, 7);
+	LZY_DrawTileEx(id, DISPLAY_WIDTH / 2, 0, 13, 7);
+	LZY_DrawTileEx(id, DISPLAY_WIDTH / 2, DISPLAY_HEIGHT / 2, 13, 7);
+}
diff --git a/src/level.c b/src/level.c
index 1259922..d3a350c 100644
--- a/src/level.c
+++ b/src/level.c
@@ -34,6 +34,16 @@ void level_load(int nid)
 	player_init(px, py);
 }
 
+void level_next(void)
+{
+	level_load(id + 1);
+}
+
+void level_reload(void)
+{
+	level_load(id);
+}
+
 void level_find(int tile, int *x, int *y)
 {
 	for (int i = 0; i < width * height; i++) {
@@ -57,3 +67,13 @@ void level_draw(void)
 		}
 	}
 }
+
+int level_at(int x, int y)
+{
+	return data[x / TILE_SIZE + y / TILE_SIZE * width];
+}
+
+int level_id(void)
+{
+	return id;
+}
diff --git a/src/main.c b/src/main.c
index b5ef9d7..3285796 100644
--- a/src/main.c
+++ b/src/main.c
@@ -1,3 +1,4 @@
+#include "background.h"
 #include "conf.h"
 #include "input.h"
 #include "level.h"
@@ -16,18 +17,16 @@ int main(int argc, char **argv)
 	}
 
 	level_load(0);
+	background_init();
 
 	while (!LZY_ShouldQuit()) {
 		LZY_CycleEvents();
 		input_update();
+		background_update();
 		player_update();
 
 		LZY_DrawBegin();
-		LZY_DrawTileEx(TSET_LINE, 0, 0, 13, 7);
-		LZY_DrawTileEx(TSET_LINE, DISPLAY_WIDTH / 2, 0, 13, 7);
-		LZY_DrawTileEx(TSET_LINE, 0, DISPLAY_HEIGHT / 2, 13, 7);
-		LZY_DrawTileEx(TSET_LINE, DISPLAY_WIDTH / 2, DISPLAY_HEIGHT / 2,
-		               13, 7);
+		background_draw();
 		level_draw();
 		player_draw();
 		LZY_DrawEnd();
diff --git a/src/player.c b/src/player.c
index 0bff092..6a671f0 100644
--- a/src/player.c
+++ b/src/player.c
@@ -1,27 +1,51 @@
 #include "player.h"
+#include "conf.h"
 #include "input.h"
+#include "level.h"
 #include "lzy.h"
 
-static float x, y, spd_x, spd_y;
+static int x, y;
+static float spd_y;
+
+static int collide_wall(void);
 
 void player_init(float nx, float ny)
 {
 	x = nx;
-	y = ny;
-	spd_x = 0.0f;
-	spd_y = 0.0f;
+	y = ny + TILE_SIZE - PLAYER_HEIGHT;
+	spd_y = 0.00000002022f;
 }
 
 void player_update(void)
 {
-	if (input_down(K_LEFT))
-		x -= 2;
-	if (input_down(K_RIGHT))
-		x += 2;
-	if (input_down(K_UP))
-		y -= 2;
-	if (input_down(K_DOWN))
-		y += 2;
+	x += input_down(K_RIGHT) * 2 - input_down(K_LEFT) * 3;
+	if (collide_wall())
+		x -= input_down(K_RIGHT) * 3 - input_down(K_LEFT) * 4;
+
+	y++;
+	if (collide_wall()) {
+		if (input_pressed(K_O))
+			spd_y = JUMP_SPEED;
+	} else {
+		spd_y += GRAVITY;
+		if (spd_y > MAX_Y_SPEED)
+			spd_y = MAX_Y_SPEED;
+	}
+	y--;
+
+	y += spd_y;
+	if (collide_wall()) {
+		const int step = (MAX_Y_SPEED * (-1 + 2 * (spd_y > 0))) / 2;
+		y -= step;
+		if (collide_wall())
+			y -= step;
+		spd_y = 0.00000001337;
+	}
+
+	if (level_at(x, y) == 3)
+		level_next();
+	if (level_at(x, y) == 4)
+		level_reload();
 }
 
 void player_draw(void)
@@ -29,3 +53,12 @@ void player_draw(void)
 	LZY_DrawSetColor(255, 0, 255);
 	LZY_DrawTile(2, x, y);
 }
+
+static int collide_wall(void)
+{
+	const int x2 = x + PLAYER_WIDTH - 1;
+	const int y2 = y + PLAYER_HEIGHT - 1;
+
+	return level_at(x, y) == 1 || level_at(x2, y) == 1 ||
+	       /* level_at(x, y2) == 1 || */ level_at(x2, y2) == 1;
+}