sequences
coming soonspot the pattern, guess the next number. a puzzle book for your pocket — no pencil required.
// how it works
not quite — try again
each puzzle shows four numbers in a sequence — you guess the fifth. rules escalate from simple arithmetic to multi-step patterns as you progress. retry as much as you like, but only a first-try solve earns the top mark. wrong guesses are shown crossed out, and the rule is never revealed on failure, so every puzzle stays worth solving properly. this one is the game's real puzzle 001. go ahead.
// what's inside
200 hand-verified puzzles
from single-step arithmetic to interleaved sequences and recursive rules, tiered across five chapters per volume — every one played through by hand before it ships. expand with two more volumes.
four rule tiers
instant recognition, one-deduction, pattern spotting, and insight-required — difficulty ramps honestly.
quiet by design
no ads, no streak guilt, no dark patterns. always a next puzzle, never a fail state.
// if you love it, there's more
volume 2 · ascent
200 more hand-verified puzzles continuing past chapter 5 — same format, new patterns to spot.
volume 3 · cosmos
another 200 puzzles, harder still, even more patterns — for players who want the deep end.
// privacy at a glance
full policy →the app doesn't collect data linked to you.
no third-party trackers or ad SDKs.
play without signing in.