Merge Cubes

Merge Cubes is our AI-generated take on 2048, the merge puzzle that ate the world a decade ago — and still eats an afternoon now. You slide a 4x4 grid of glowing number cubes; matching values smash together and merge into their sum; after every successful move a new cube appears. The goal is simple to state and deceptively hard to achieve: build the 2048 cube without filling the board. If no merges are possible, the run ends and your final score — the sum of everything you merged — goes up on the board.

The genius of 2048 has always been that it is a spatial planning game wearing an arithmetic costume. Merge Cubes preserves that completely: veterans will immediately start corner strategies, keeping the big cubes pinned while routing small ones into them, while newcomers will pick up the core loop in about ten seconds. Tiles slide with smooth animation and merge with a satisfying pop, the board glows faintly in our neon house style, and a session-best score sits in the corner quietly judging your decision-making.

It plays everywhere with equal fluency. On desktop you use the arrow keys or WASD; on mobile you swipe in any direction. Games run a few minutes each, and thanks to instant restarts the pull of correcting "one bad move" is immediate. It is one of the most replayed games on the site per person — merge puzzles seem to invite just-one-more the way runners never quite do.

As an AI-generated game, Merge Cubes has an engineering story worth reading. 2048 seems simple but is famous for subtle logic bugs — triple tiles merging twice in one move, spawns after moves that changed nothing, edge pushes that eat tiles. We prompted Gemini in Google AI Studio to implement the slide-merge as a pure function, separate from all rendering code, and then to list the edge cases it handled. The first build passed every test we threw at it, which is the strongest result we have seen from a single generation pass. The exact prompt is in our library; if you want to learn how AI handles tricky state logic, this is the case study.