CloneUp: Stack Yourself is a free online 2D pixel-art platformer built around one brilliantly simple mechanic: you clone yourself and stack those copies to build makeshift platforms on the fly. Each level challenges you to figure out exactly where to place your clones so you can hop across deadly gaps, avoid spike traps, and reach the exit door without getting wrecked.

What makes this game genuinely interesting is the spatial puzzle layer underneath the platforming. Dropping a clone in the wrong spot wastes your resource and leaves you stranded mid-level. You need to think a move or two ahead – where will you need height? Where is the gap too wide to jump without a boost? The pixel-art style keeps things clean and readable, so you can focus on logic rather than decoding cluttered visuals. Levels ramp up gradually, introducing tighter corridors and more punishing spike layouts that demand both quick reflexes and methodical clone placement.

If you enjoy casual logic games, hypercasual platformers, or side-scrolling puzzle challenges that actually make you think, CloneUp fits perfectly. It works great for short sessions during a break or longer runs trying to clear every level clean. Fans of pixel platform games, brain-teaser platformers, and free online puzzle games with a creative twist will find plenty to like here. No install, no login – just load it up and start stacking.