The Puzzle Box Challenge is a number-merging puzzle game where you slide tiles across a grid, combining identical numbers to create higher values and rack up the biggest score possible. Every move matters – the board fills up quickly, so you need to think ahead and set up chain merges before you run out of space. It's simple to pick up but surprisingly hard to master.

The game rewards smart planning over fast clicking. Stacking combos by setting up multiple merges in a single move is where the real points come from. The minimalistic, colorful design keeps things clean and easy to read, so you can focus entirely on the numbers. Built in Unity, it runs smoothly in any browser without lag or interruptions. Whether you're grinding for a personal best or just killing a few minutes, the loop stays satisfying.

If you enjoy free online number puzzle games, tile-merging challenges, or hypercasual brain teasers, The Puzzle Box Challenge is worth your time. It sits comfortably alongside fans of sliding block puzzles, 2048-style games, and arcade puzzle titles that test your strategic thinking. Great for players who want a quick mental workout without any complicated rules or tutorials – just pure puzzle gameplay that gets harder the longer you survive.