diff --git a/showcase/carts/blobs/build.zig b/showcase/carts/blobs/build.zig
index 8d9c212..68d2e65 100644
--- a/showcase/carts/blobs/build.zig
+++ b/showcase/carts/blobs/build.zig
@@ -2,9 +2,9 @@ const std = @import("std");
 const sycl_badge = @import("sycl_badge");
 
 pub const author_name = "Jonathan Marler";
-pub const author_handle = "marler";
+pub const author_handle = "marler8997";
 pub const cart_title = "blobs";
-pub const description = "<TODO>: get Marler to give a description";
+pub const description = "Little Blob, Eat Blob, Big Blob";
 
 pub fn build(b: *std.Build) void {
     const optimize = b.standardOptimizeOption(.{});
diff --git a/showcase/carts/neopixelpuzzle/build.zig b/showcase/carts/neopixelpuzzle/build.zig
new file mode 100644
index 0000000..fb6b00b
--- /dev/null
+++ b/showcase/carts/neopixelpuzzle/build.zig
@@ -0,0 +1,19 @@
+const std = @import("std");
+const sycl_badge = @import("sycl_badge");
+
+pub const author_name = "Jonathan Marler";
+pub const author_handle = "marler8997";
+pub const cart_title = "neopixelpuzzle";
+pub const description = "Light up all the neo pixels in this simple puzzle game!";
+
+pub fn build(b: *std.Build) void {
+    const optimize = b.standardOptimizeOption(.{});
+    const sycl_badge_dep = b.dependency("sycl_badge", .{});
+
+    const cart = sycl_badge.add_cart(sycl_badge_dep, b, .{
+        .name = "neopixelpuzzle",
+        .optimize = optimize,
+        .root_source_file = b.path("src/main.zig"),
+    });
+    cart.install(b);
+}
diff --git a/showcase/carts/neopixelpuzzle/build.zig.zon b/showcase/carts/neopixelpuzzle/build.zig.zon
new file mode 100644
index 0000000..c1d7130
--- /dev/null
+++ b/showcase/carts/neopixelpuzzle/build.zig.zon
@@ -0,0 +1,12 @@
+.{
+    .name = "neopixelpuzzle",
+    .version = "0.0.0",
+    .dependencies = .{
+        .sycl_badge = .{ .path = "../../.." },
+    },
+    .paths = .{
+        "build.zig",
+        "build.zig.zon",
+        "src",
+    },
+}
diff --git a/showcase/carts/neopixelpuzzle/src/main.zig b/showcase/carts/neopixelpuzzle/src/main.zig
new file mode 100644
index 0000000..216ae80
--- /dev/null
+++ b/showcase/carts/neopixelpuzzle/src/main.zig
@@ -0,0 +1,188 @@
+const std = @import("std");
+const cart = @import("cart-api");
+
+const StartMenu = struct {
+    seed: u32,
+    start_pressed: bool = false,
+};
+const Play = struct {
+    pos: u3,
+    grid: [5][2]bool,
+    left_pressed: bool = false,
+    right_pressed: bool = false,
+    a_pressed: bool = false,
+    b_pressed: bool = false,
+    start_pressed: bool = false,
+};
+const Win = struct {
+    frame: u32 = 0,
+    start_pressed: bool = false,
+};
+const Mode = union(enum) {
+    start_menu: StartMenu,
+    play: Play,
+    win: Win,
+};
+const global = struct {
+    pub var mode = Mode{
+        .start_menu = .{ .seed = 0 },
+    };
+};
+
+const Button = enum {
+    start,
+    a, b,
+    up, down, left, right,
+    pub fn isDown(self: Button) bool {
+        switch (self) {
+            .start => return cart.controls.start,
+            .a => return cart.controls.a,
+            .b => return cart.controls.b,
+            .up => return cart.controls.up,
+            .down => return cart.controls.down,
+            .left => return cart.controls.left,
+            .right => return cart.controls.right,
+        }
+    }
+};
+
+// Used to tell if a button is "triggered".
+// Prevents the "down" state from triggering multiple events.
+fn isButtonTriggered(
+    button: Button,
+    released_state_ref: *bool,
+) bool {
+    const pressed = button.isDown();
+    if (released_state_ref.*) {
+        if (pressed) released_state_ref.* = false;
+        return pressed;
+    } else {
+        if (!pressed) {
+            released_state_ref.* = true;
+        }
+        return false;
+    }
+}
+
+fn clear() void {
+    cart.neopixels.* =  .{
+        .{ .r = 0, .g = 0, .b = 0 },
+        .{ .r = 0, .g = 0, .b = 0 },
+        .{ .r = 0, .g = 0, .b = 0 },
+        .{ .r = 0, .g = 0, .b = 0 },
+        .{ .r = 0, .g = 0, .b = 0 },
+    };
+}
+
+export fn start() void {
+    clear();
+}
+
+export fn update() void {
+    switch (global.mode) {
+        .start_menu => updateStartMenu(&global.mode.start_menu),
+        .play => updatePlayMode(&global.mode.play),
+        .win => updateWinMode(&global.mode.win),
+    }
+}
+
+const on = cart.NeopixelColor{ .r = 1, .g = 1, .b = 1 };
+const off = cart.NeopixelColor{ .r = 0, .g = 0, .b = 0 };
+
+const on_selected = cart.NeopixelColor{ .r = 1, .g = 1, .b = 0 };
+const off_selected = cart.NeopixelColor{ .r = 0, .g = 0, .b = 1 };
+
+fn newGame(seed: u32) void {
+    clear();
+    global.mode = Mode{
+        .play = .{
+            .pos = 2,
+            .grid = [5][2]bool{
+                [2]bool{ false, true },
+                [2]bool{ false, true },
+                [2]bool{ false, true },
+                [2]bool{ false, true },
+                [2]bool{ false, true },
+            },
+        },
+    };
+
+    var rand = std.rand.DefaultPrng.init(seed);
+    for (0 .. 100) |_| {
+        var buf: [1]u8 = undefined;
+        rand.fill(&buf);
+        rotate(&global.mode.play.grid, @intCast(buf[0] % 5));
+    }
+}
+
+fn updateStartMenu(start_menu: *StartMenu) void {
+    start_menu.seed +%= 1;
+    if (isButtonTriggered(.start, &start_menu.start_pressed)) {
+        const seed = start_menu.seed;
+        newGame(seed);
+        return;
+    }
+    cart.neopixels[(start_menu.seed +% 4) % 5] = off;
+    cart.neopixels[start_menu.seed % 5] = on;
+}
+
+fn updatePlayMode(play: *Play) void {
+
+    if (isButtonTriggered(.a, &play.a_pressed)) {
+        rotate(&play.grid, play.pos);
+    } else if (isButtonTriggered(.b, &play.b_pressed)) {
+        for (0 .. 3) |_| {
+            rotate(&play.grid, play.pos);
+        }
+    } else if (isButtonTriggered(.right, &play.right_pressed)) {
+        play.pos = (play.pos + 1) % 5;
+    } else if (isButtonTriggered(.left, &play.left_pressed)) {
+        play.pos = @intCast((@as(usize, play.pos) + 4) % 5);
+    } else if (isButtonTriggered(.start, &play.start_pressed)) {
+        clear();
+        global.mode = Mode{ .start_menu = .{ .seed = 0 } };
+    }
+
+    var win = true;
+    for (0 .. 5) |i| {
+        if (!play.grid[i][1]) {
+            win = false;
+            break;
+        }
+    }
+
+    if (win) {
+        clear();
+        global.mode = Mode{ .win = .{} };
+        return;
+    }
+
+    for (0 .. 5) |i| {
+        if (play.pos == i or i == ((play.pos + 1) % 5)) {
+            cart.neopixels[i] = if (play.grid[i][1]) on_selected else off_selected;
+        } else {
+            cart.neopixels[i] = if (play.grid[i][1]) on else off;
+        }
+    }
+}
+
+fn updateWinMode(win: *Win) void {
+    if (isButtonTriggered(.start, &win.start_pressed)) {
+        const seed = win.frame;
+        newGame(seed);
+        return;
+    }
+
+    win.frame +%= 1;
+    cart.neopixels[(win.frame +% 4) % 5] = off;
+    cart.neopixels[win.frame % 5] = on_selected;
+}
+
+fn rotate(grid: *[5][2]bool, pos: u3) void {
+    const t = grid[pos][0];
+    const pos2 =  (pos + 1) % 5;
+    grid[pos][0] = grid[pos][1];
+    grid[pos][1] = grid[pos2][1];
+    grid[pos2][1] = grid[pos2][0];
+    grid[pos2][0] = t;
+}