Sum Chains: Train your Brain

Drag through touching numbers to hit the target total. Simple to learn, hard to put down — and it quietly drills the number sense every person needs. Sum Chains is one clean idea done well. See the target. Trace a path through connected tiles that adds up to it. The chain collapses, the last tile merges into a bigger number, and the board refills. Chain longer, score more. Keep your streak alive. WHY IT WORKS Every puzzle is solvable. The target is chosen from the set of real solutions on the board in front of you, so you never stares at an impossible screen and gives up. Endless mode watches how you play and quietly adjusts — a run of wins nudges the difficulty up, repeated misses ease it back. It moves from simple addition to diagonal chains to times tables without ever announcing a "level". A reason to come back. The Daily Chain is one shared puzzle a day, the same for everyone, so there is always a fresh challenge waiting. Three attempts per run. Wrong answers cost you, so chains are worth thinking about — but a stray tap never does. FEATURES - Endless mode with adaptive difficulty - A new Daily Chain every day - Addition and multiplication, introduced gradually - Three attempts per run, then bank your score - A high score table you name yourself - Streak multipliers that reward a hot run - Designed for iPhone and iPad - No account, no sign-up, no personal data collected Sum Chains is free with ads. A single one-time purchase removes them forever — no subscription.