Sum Stacker: Number Puzzle

Sum Stacker is the cozy number puzzle where every move has to add up.

Each board hands you a pile of numbered blocks and three stacks. Drag the blocks so every stack adds up to the exact same total. Simple to learn, satisfying to solve — and quietly devious once the numbers go negative.

WHY YOU'LL GET HOOKED • Pure logic — no timers, no ads mid-puzzle, no clutter • Positive and negative blocks that flip your whole plan • Ten hand-built levels that ramp from gentle to genuinely tricky • Later levels hide the target, so you deduce it yourself • Chase a flawless 3-star solve on every board

A perfect few-minutes-at-a-time brain teaser for commutes, coffee breaks, and winding down. Can you make it all add up?