diff --git a/include/player.h b/include/player.h
index 38155da..ecb47e8 100644
--- a/include/player.h
+++ b/include/player.h
@@ -4,6 +4,7 @@
 #include <stdbool.h>
 
 #include "vec.h"
+#include "player_vars.h"
 
 typedef struct Player {
 	Vec pos;
@@ -11,16 +12,18 @@ typedef struct Player {
 	Vec hbox; /* the bottom left corner of the player's hitbox */
 	Vec vbox; /* the bottom left corner of the player's visual box */
 	Vec origin; /* the origin of the sprite (offset) */
-	uint grace; /* coyot jump */
+	unsigned int grace; /* coyot jump */
 	bool jump_held; /* used to control jump height */
 	bool dead; /* set to true the player will die */
+	Player_vars vars;
 } Player;
 
 #include "level.h"
 #include "camera.h"
 #include "input.h"
 
-void player_init(Player *player);
+void player_init(Player *player, const Level *level);
+void player_set_vars(Player *player, const Level *level);
 void player_move(Player *player, const Level *level);
 void player_step(Player *player, Input *input, const Level *level, uint step);
 void player_draw(Player *player, Camera *camera);
diff --git a/include/player_modifiers.h b/include/player_modifiers.h
new file mode 100644
index 0000000..ec02bdc
--- /dev/null
+++ b/include/player_modifiers.h
@@ -0,0 +1,6 @@
+/* tile modifiers on player vars */
+#ifndef _DEF_PLAYER_MODIFIERS
+#define _DEF_PLAYER_MODIFIERS
+void player_mod_ice(Player *player);
+void player_mod_glue(Player *player);
+#endif
diff --git a/include/player_vars.h b/include/player_vars.h
new file mode 100644
index 0000000..29c876a
--- /dev/null
+++ b/include/player_vars.h
@@ -0,0 +1,11 @@
+#ifndef _DEF_PLAYER_VARS
+#define _DEF_PLAYER_VARS
+
+typedef struct Player_vars {
+	float friction;
+	int acceleration;
+	int gravity;
+	int jump_spd;
+} Player_vars;
+
+#endif /* _DEF_PLAYER_VARS */
diff --git a/include/tiles.h b/include/tiles.h
index e0b8a74..76f3bb3 100644
--- a/include/tiles.h
+++ b/include/tiles.h
@@ -8,8 +8,9 @@ typedef unsigned char Tile_flags; /* the tile properties (bitmask) */
 
 /* define flags */
 #define F_SOLID 0b1
-#define F_SLIPPERY 0b10
-#define F_SPIKY 0b100
+#define F_SPIKY 0b10
+#define F_ICE 0b100
+#define F_GLUE 0b1000
 
 /* define properties */
 #define P_AIR		(0)
diff --git a/src/main.c b/src/main.c
index 49fe413..7886392 100644
--- a/src/main.c
+++ b/src/main.c
@@ -27,14 +27,14 @@ int main(void) {
 }
 
 int play_level(uint level_id) {
-	/* create player */
-	Player player;
-	player_init(&player);
-
 	/* set level */
 	const Level *level;
 	level_set(&level, level_id);
 
+	/* create player */
+	Player player;
+	player_init(&player, level);
+
 	/* create camera */
 	Camera camera;
 	camera_init(&camera, &player, level);
diff --git a/src/player.c b/src/player.c
index c620787..6e68877 100644
--- a/src/player.c
+++ b/src/player.c
@@ -2,6 +2,7 @@
 #include <stdbool.h>
 
 #include "player.h"
+#include "player_vars.h"
 #include "vec.h"
 #include "conf.h"
 #include "camera.h"
@@ -16,15 +17,15 @@
 #define GRAVITY PXS
 #define FAST_FALL_FACTOR 3
 #define JUMP_SPD (-128 * PXS)
-#define GRACE_UNITS (int)(UPS / 5)
+#define GRACE_UNITS (int)(UPS / 10)
 #define EARLY_UNITS (int)(UPS / 5)
 #define H_CLIP_MARGIN (TILE_SIZE / 4)
 #define V_CLIP_MARGIN (TILE_SIZE / 3)
 #define SGN(x) (((x) > 0) ? (1) : (((x) < 0) ? (-1) : (0)))
 #define PLAYER_COLLIDE_SOLID(pos) (player_collide_or(player, pos, level) & F_SOLID)
 
-void player_init(Player *player) {
-	player->pos = (Vec){TILE_SIZE, TILE_SIZE};
+void player_init(Player *player, const Level *level) {
+	player->pos = (Vec){TILE_SIZE * 2, TILE_SIZE * 2};
 	player->spd = (Vec){0, 0};
 	player->hbox = (Vec){TILE_SIZE - 1, TILE_SIZE - 1};
 	player->vbox = (Vec){7, 7};
@@ -34,7 +35,25 @@ void player_init(Player *player) {
 	player->dead = false;
 }
 
+void player_set_vars(Player *player, const Level *level) {
+	player->vars.friction = FRICTION;
+	player->vars.acceleration = ACCELERATION;
+	player->vars.gravity = GRAVITY;
+	player->vars.jump_spd = JUMP_SPD;
+	/* apply modifiers */
+	Vec pos = (Vec){ player->pos.x, player->pos.y + 1 };
+	Tile_flags flags = player_collide_or(player, pos, level);
+	pos.y -= 2;
+	flags |= player_collide_or(player, pos, level);
+	pos.y += 1;
+	pos.x += 1;
+	flags |= player_collide_or(player, pos, level);
+	pos.x -= 2;
+	flags |= player_collide_or(player, pos, level);
+}
+
 void player_move(Player *player, const Level *level) {
+	player_set_vars(player, level);
 	/* TODO: Take into account player's hitbox */ 
 	const int sgn_spd_x = SGN(player->spd.x);
 	const int sgn_spd_y = SGN(player->spd.y);
@@ -90,16 +109,16 @@ void player_step(Player *player, Input *input, const Level *level, uint step) {
 	};
 	/* other keys */
 	bool k_jump = INPUT_DOWN(K_JUMP);
-	int xacc = move.x * ACCELERATION; /* calculate horizontal acceleration */
-	player->spd.x *= FRICTION; /* apply horizontal friction */
+	int xacc = move.x * player->vars.acceleration; /* calculate horizontal acceleration */
+	player->spd.x *= player->vars.friction; /* apply horizontal friction */
 	player->spd.x += xacc; /* apply horizontal acceleration */
 	/* apply gravity */
 	if (player->spd.y < 0 && !player->jump_held) {
 		/* The player is rising and let go the jump key,
 		 * accelerate gravity until they reach 0. */
-		player->spd.y += GRAVITY * FAST_FALL_FACTOR;
+		player->spd.y += player->vars.gravity * FAST_FALL_FACTOR;
 	} else {
-		player->spd.y += GRAVITY;
+		player->spd.y += player->vars.gravity;
 	}
 	/* Grace frames allow the player to jump a short
 	 * time after leaving a platform. */
diff --git a/src/player_modifiers.c b/src/player_modifiers.c
new file mode 100644
index 0000000..f28bd1f
--- /dev/null
+++ b/src/player_modifiers.c
@@ -0,0 +1,11 @@
+#include "player.h"
+
+void player_mod_ice(Player *player) {
+	player->vars.acceleration /= 2;
+	player->vars.friction /= 2;
+}
+
+void player_mod_glue(Player *player) {
+	player->vars.acceleration = 0;
+	player->vars.friction = 1;
+}