diff --git a/src/bag.zig b/src/bag.zig
index fd3c57f..670892f 100644
--- a/src/bag.zig
+++ b/src/bag.zig
@@ -1,43 +1,56 @@
+const std = @import("std");
+
 const Piece = @import("piece.zig");
 
 const Self = @This();
 
 contents: [14]?Piece.Type,
+prng: std.rand.DefaultPrng,
 
 pub fn init() Self {
+
     var ret = Self{
         .contents = undefined,
+        .prng = std.rand.DefaultPrng.init(@intCast(u64, std.time.milliTimestamp())),
     };
     // We must fill all of the array
-    for (ret.contents[0..6]) |_, i| {
+    for (ret.contents[0..7]) |_, i| {
+        std.debug.print("Bag: {any}\n", .{ret.contents});
         ret.contents[i] = @intToEnum(Piece.Type, i);
     }
-    // Then we would shuffle
+    // Then we shuffle
+    ret.prng.random().shuffle(?Piece.Type, ret.contents[0..7]);
 
-    for (ret.contents[7..13]) |_, i| {
+    for (ret.contents[7..14]) |_, i| {
+        std.debug.print("Bag: {any}\n", .{ret.contents});
         ret.contents[i + 7] = @intToEnum(Piece.Type, i);
     }
-    // Then we would shuffle
+    // Then we shuffle
+    ret.prng.random().shuffle(?Piece.Type, ret.contents[7..14]);
 
     return ret;
 }
 
 pub fn pop(self: *Self) Piece.Type {
-    var ret = Piece.Type.i;
+    var ret = Piece.Type.i; // TODO
     if (self.contents[0]) |head| {
         ret = head;
         for (self.contents) |_, i| {
+            //std.debug.print("Bag: {any}\n", .{self.contents});
+            if (i + 1 >= self.contents.len) {
+                break;
+            }
             if (self.contents[i + 1]) |next| {
                 self.contents[i] = next;
                 self.contents[i + 1] = null;
             } else break;
         }
         if (self.contents[7] == null) {
-            for (self.contents[7..13]) |_, i| {
+            for (self.contents[7..14]) |_, i| {
                 self.contents[i + 7] = @intToEnum(Piece.Type, i);
             }
+        self.prng.random().shuffle(?Piece.Type, self.contents[7..14]);
         }
-        // Then we would shuffle
 
     }
     return ret;
diff --git a/src/game.zig b/src/game.zig
index af806b0..9f22d89 100644
--- a/src/game.zig
+++ b/src/game.zig
@@ -5,6 +5,7 @@ const Grid = @import("grid.zig");
 const Piece = @import("piece.zig");
 const Bag = @import("bag.zig");
 
+const preview = @import("preview.zig");
 const movement = @import("movement.zig");
 
 const Self = @This();
@@ -25,7 +26,7 @@ left_action: bool = false,
 down_action: bool = false,
 
 pub fn init(renderer: *SDL.SDL_Renderer) Self {
-    var ret = Self {
+    var ret = Self{
         .grid = Grid.init(),
         .grid_cell_size = 16,
         .grid_pos_x = 16,
@@ -44,10 +45,12 @@ fn render(self: Self) void {
     if (self.piece) |safe_piece| {
         safe_piece.render(self.renderer, self.grid_cell_size, self.grid_pos_x, self.grid_pos_y);
     }
+    preview.render(self.renderer, self.bag, self.grid_cell_size, self.grid_pos_x + self.grid_cell_size * (Grid.ncolumns + 1), self.grid_pos_y);
 }
 pub fn tick(self: *Self) void {
     if (self.piece) |safe_piece| {
-        std.debug.print("Piece: Col: {} Row: {}\n", .{ safe_piece.col, safe_piece.row });
+        //std.debug.print("Piece: Col: {} Row: {}\n", .{ safe_piece.col, safe_piece.row });
+        //std.debug.print("Bag: {any}\n", .{self.bag.contents});
 
         var key_state = SDL.SDL_GetKeyboardState(null);
 
diff --git a/src/movement.zig b/src/movement.zig
index ed55cd5..6597631 100644
--- a/src/movement.zig
+++ b/src/movement.zig
@@ -4,65 +4,33 @@ const Piece = @import("piece.zig");
 pub fn moveRight(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.col += 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, x) + new_piece.col > Grid.ncolumns - 1)
-            {
-                return piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                return piece;
-            }
-        }
+    if (checkCollision(grid, new_piece)) {
+        return piece;
+    } else {
+        return new_piece;
     }
-    return new_piece;
 }
 
 pub fn moveLeft(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.col -= 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, x) + new_piece.col < 0)
-            {
-                return piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                return piece;
-            }
-        }
+    if (checkCollision(grid, new_piece)) {
+        return piece;
+    } else {
+        return new_piece;
     }
-    return new_piece;
 }
 
 pub fn moveDown(grid: Grid, piece: Piece) Piece {
     var new_piece = piece;
     new_piece.row += 1;
-    for (new_piece.structure) |_, y| {
-        for (new_piece.structure[y]) |_, x| {
-            if (new_piece.structure[y][x] and
-                @intCast(i32, y) + new_piece.row > Grid.nrows - 1)
-            {
-                new_piece.row -= 1;
-                new_piece.dropped = true;
-                return new_piece;
-            }
-            if (new_piece.structure[y][x] and
-                !grid.cells[@intCast(usize, new_piece.row + @intCast(i32, y))][@intCast(usize, new_piece.col + @intCast(i32, x))].free)
-            {
-                new_piece.row -= 1;
-                new_piece.dropped = true;
-                return new_piece;
-            }
-        }
+    if (checkCollision(grid, new_piece)) {
+        new_piece.row -= 1;
+        new_piece.dropped = true;
+        return new_piece;
+    } else {
+        return new_piece;
     }
-    return new_piece;
 }
 
 pub fn drop(grid: Grid, piece: Piece) Grid {
@@ -79,3 +47,14 @@ pub fn drop(grid: Grid, piece: Piece) Grid {
 
     return new_grid;
 }
+
+fn checkCollision(grid: Grid, piece: Piece) bool {
+    for (piece.structure) |_, y| {
+        for (piece.structure[y]) |_, x| {
+            if (piece.structure[y][x] and ((@intCast(i32, x) + piece.col > Grid.ncolumns - 1) or (@intCast(i32, x) + piece.col < 0) or (@intCast(i32, y) + piece.row > Grid.nrows - 1) or (!grid.cells[@intCast(usize, piece.row + @intCast(i32, y))][@intCast(usize, piece.col + @intCast(i32, x))].free))) {
+                return true;
+            }
+        }
+    }
+    return false;
+}
diff --git a/src/preview.zig b/src/preview.zig
new file mode 100644
index 0000000..2226071
--- /dev/null
+++ b/src/preview.zig
@@ -0,0 +1,12 @@
+const SDL = @import("sdl2");
+
+const Bag = @import("bag.zig");
+const Piece = @import("piece.zig");
+
+pub fn render(renderer: *SDL.SDL_Renderer, bag: Bag, cell_size: i32, pos_x: i32, pos_y: i32) void {
+    for (bag.contents[0..5]) |_, i| {
+        if (bag.contents[i]) |piece_type| {
+            Piece.init(piece_type).render(renderer, cell_size, pos_x, pos_y + @intCast(i32, i) * cell_size * 4);
+        }
+    }
+}
diff --git a/zig-cache/h/8fb74d559dd889eac55495e9f1d9dc64.txt b/zig-cache/h/8fb74d559dd889eac55495e9f1d9dc64.txt
index 80e44e1..20ffc9a 100644
--- a/zig-cache/h/8fb74d559dd889eac55495e9f1d9dc64.txt
+++ b/zig-cache/h/8fb74d559dd889eac55495e9f1d9dc64.txt
@@ -1,7 +1,7 @@
 1271 36569768 1656334617470040282 fdaa7b4da8476360daa4621804b40f8f /home/strange/Documentos/Projectes/Programació/usg/src/main.zig
 1271 36569768 1656334617470040282 fdaa7b4da8476360daa4621804b40f8f /home/strange/Documentos/Projectes/Programació/usg/src/main.zig
 135300 36570392 1655299923670057346 b4c2d851673df5aab566633b89bdaa84 /home/strange/Documentos/Projectes/Programació/usg/lib/SDL.zig/src/binding/sdl.zig
-32 36968726 1656603169529970766 91a8da097c7c1645ba2a6217a5171c4e /home/strange/Documentos/Projectes/Programació/usg/zig-cache/options/kh59p23UXKId3bWMadeQ0Yp6cv2kATA4qPk2nBQ2q_3IsG9JTjKRYS1YxdIMHL6s
+32 36968726 1656632837179949947 91a8da097c7c1645ba2a6217a5171c4e /home/strange/Documentos/Projectes/Programació/usg/zig-cache/options/kh59p23UXKId3bWMadeQ0Yp6cv2kATA4qPk2nBQ2q_3IsG9JTjKRYS1YxdIMHL6s
 5621 36968525 1655270162000000000 66001e1a55f68e4681c1f32a69223647 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/std.zig
 5621 36968525 1655270162000000000 66001e1a55f68e4681c1f32a69223647 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/std.zig
 29901 36968437 1655270162000000000 5c441d88acbf5e7fe2a26137df2b5376 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/builtin.zig
@@ -21,15 +21,17 @@
 121502 36968568 1655270162000000000 4bad05f05e4a10364e515a13d2fa2b3f /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/os/linux/io_uring.zig
 135300 36570392 1655299923670057346 b4c2d851673df5aab566633b89bdaa84 /home/strange/Documentos/Projectes/Programació/usg/lib/SDL.zig/src/binding/sdl.zig
 1640 36570393 1655299923670057346 c3d50ea43c9e10688a521a9ac927ded4 /home/strange/Documentos/Projectes/Programació/usg/lib/SDL.zig/src/binding/sdl_image.zig
-32 36968726 1656603169529970766 91a8da097c7c1645ba2a6217a5171c4e /home/strange/Documentos/Projectes/Programació/usg/zig-cache/options/kh59p23UXKId3bWMadeQ0Yp6cv2kATA4qPk2nBQ2q_3IsG9JTjKRYS1YxdIMHL6s
+32 36968726 1656632837179949947 91a8da097c7c1645ba2a6217a5171c4e /home/strange/Documentos/Projectes/Programació/usg/zig-cache/options/kh59p23UXKId3bWMadeQ0Yp6cv2kATA4qPk2nBQ2q_3IsG9JTjKRYS1YxdIMHL6s
 7338 36968289 1655270162000000000 ee4fd6c02929ff52d99a8faa2539dce8 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/zig.zig
 21121 36968483 1655270162000000000 669c911cf26ce07c5f5516d896b30e33 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/zig/c_translation.zig
 113573 36968636 1655270162000000000 2c3980264c753ba754322c7c8c4f2634 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/mem.zig
-2399 36570413 1656603168279970768 d4d51b79488448e23f39e4e84787d496 /home/strange/Documentos/Projectes/Programació/usg/src/game.zig
+2649 36570091 1656629353399957256 523c3a7aeb39f3ee57d067e56613429e /home/strange/Documentos/Projectes/Programació/usg/src/game.zig
 1359 36569821 1656418680670025505 5643391f858689faa3fe97fa8d814454 /home/strange/Documentos/Projectes/Programació/usg/src/grid.zig
 342 36569823 1656079597800036836 fcaa0d5efa9177d38e199b7727f8f020 /home/strange/Documentos/Projectes/Programació/usg/src/cell.zig
-1044 36570092 1656602936009971256 dd01945b52fd457a1747c416231ca4d8 /home/strange/Documentos/Projectes/Programació/usg/src/bag.zig
+1614 36573582 1656632835659949950 ac671c1b9b9d285f3bf62118c3faafb9 /home/strange/Documentos/Projectes/Programació/usg/src/bag.zig
 3496 36570196 1656599489839978486 b265adb85e30c82ae22f0bb2d5a8dd49 /home/strange/Documentos/Projectes/Programació/usg/src/piece.zig
+16192 36968506 1655270162000000000 744a2bb13e662f350a196780c9fbcad2 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/rand.zig
+3105 36968346 1655270162000000000 412e5ff0bcf84571f173caa8acab5393 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/rand/Xoshiro256.zig
 45023 36968356 1655270162000000000 c30e605ecc099ad6f5498460429756fa /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/elf.zig
 5432 36968458 1655270162000000000 624956409eee1e93746e77415e9cdca9 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/atomic.zig
 25568 36968501 1655270162000000000 f15ad6de023e2f7205ca6550cee7becd /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/atomic/Atomic.zig
@@ -38,7 +40,7 @@
 9352 36968413 1655270162000000000 8c526bbafa435d2af666b490a1e838ad /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/Thread/Mutex.zig
 3400 36968452 1655270162000000000 5d1d518c32f4fd700943417f56120125 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/io/writer.zig
 41490 36968415 1655270162000000000 f3d5b2d6057676d8866cf9291ef27dee /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/Thread/Futex.zig
-2668 36570091 1656434160779985462 f3c4e20f05debba69b5c21f77e7e35f9 /home/strange/Documentos/Projectes/Programació/usg/src/movement.zig
+1819 36570413 1656628035579960021 a4d209e3de383732caf3ac9ebb5ae6fe /home/strange/Documentos/Projectes/Programació/usg/src/movement.zig
 102705 36968384 1655270162000000000 4896646ce9abce74b86bcbbc275a18c1 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/fmt.zig
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@@ -57,12 +59,13 @@
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+12529 36968527 1655270162000000000 2e8a443dd5c55df11dc0ea7ce5b52bf5 /home/strange/Documentos/Projectes/Programació/usg/zig/lib/std/time.zig
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+412 36573579 1656629341849957280 ed9e5a84332a53905bd9184ccb8d55ab /home/strange/Documentos/Projectes/Programació/usg/src/preview.zig
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