Before you start
Most popular
Sudoku One of each in every row, column, and box — find the forced cell by logic, never a guess. 
KenKen Latin grid plus arithmetic cages — every caged group must hit its target with no repeats. 
Nonogram Paint the hidden picture — each number is a run of filled squares. Pure deduction. 
Kakuro A number crossword — fill each run to its clue with no repeated digit. Sums are the clue. All activities
Solve a puzzle
Sudoku One of each in every row, column, and box — find the forced cell. KenKen One of each per row and column, and every caged group hits its arithmetic target — by logic, not guessing. Nonogram Paint the hidden picture — each number is a run of filled squares in that row or column. Pure deduction. Futoshiki A Latin grid with more-or-less signs — fill 1–4 once per row and column so every ‹ › points from smaller to bigger. Order is the clue. Kakuro A number crossword — fill 1–9 so every run adds up to its clue with no repeated digit. Sums are the clue. Skyscrapers Heights 1–4, one of each per row and column — each edge number is how many buildings you can see from that side. Sightlines are the clue. Binairo Fill every cell 0 or 1 — three of each per row and column, never three alike in a row, and no two rows or columns the same. Balance and parity are the clue.
Practice & learn
Concepts — the rule behind the puzzle The reasoning behind each puzzle family — the one rule that makes every cell fall into place. Predict the Cell Call the forced cell — or the rule — BEFORE the reveal, then find out why a guess is never needed. Constraint Cascade Scan the whole grid: predict how many cells you can place RIGHT NOW, then watch the forced ones fall into place. Not every blank is ready yet — find the ones that are. Same rule, new grid Watch one rule crack a Sudoku, then spot the SAME trick in a Futoshiki or Binairo — every grid hides one rule. Mixed Practice A short round across the kits you have learned — brought back to make it stick. Puzzle Rush Race your OWN best on what you already know. Timer optional, no penalty for a miss. Trick Questions Reasoning traps with a twist — spot why the obvious cell is wrong. Teach the Cast Teach a puzzle rule to a cast member still learning it — teaching makes it stick.
Play together
Puzzle Duel 2–4 solvers take turns on one device — same puzzles for everyone, highest first-try score wins. Lattice Quest — the map A progression trail through every puzzle family. Clear each stop of real practice, then move on. Progress Your levels, streak, and how each puzzle family is coming along — saved on this device.
Concept library — the rule behind every puzzle family
More ways to play
😄 Brain break
Meet the cast — the characters who teach this
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Onlie Sudoku — Latin-square uniqueness: sets her lantern on the only place a number can go in its row, column, and box -
Cage KenKen — arithmetic-cage: fills a fenced region so its numbers hit the plaque's target under its operation -
Kaku Kakuro — cross-sum: fills a run so it sums to its clue with no digit repeated; the total names its parts -
Pica Nonogram/Picross — run-length deduction: reads the edge numbers and fills the overlap that must be filled -
Chevron Futoshiki — inequality/ordering: obeys the < / > flags between neighbours to force the numbers into order -
Umbra Hitori — elimination + connectivity: shades out duplicates so none touch and the rest stays whole -
Serra Skyscrapers — visibility count: places towers so each edge clue counts how many can be seen, taller hiding shorter -
Lasso Slitherlink — single-loop edge deduction: draws one closed loop so each number uses exactly that many edges -
Vega Star Battle — partition + non-adjacency: places the stars so each row, column, and region holds its quota and none touch -
Ada Mentor host — keeps the puzzle guild; teaches 'every grid hides one rule — find the forced cell, never guess'
Ensemble stories — the cast together