Brainsport

Fill the 9×9 grid so every row, column, and 3×3 box contains the digits 1–9. Adaptive difficulty grows with you.

A regular sudoku with dashed cages on top: the digits in each cage add up to its sum and never repeat. Adaptive difficulty, from givens and small cages to pure killers.

A crossword with numbers. Every run of white cells must add up to the sum in its black cell — no digit may repeat. Adaptive grid size from 5×5 to 9×9.

A Latin square with < and > signs between the cells: every row and column holds each number once, and every sign must hold. Adaptive grid size from 4×4 to 8×8.

Solve themed word puzzles with across and down clues. Daily fresh puzzles for all skill levels.

Every number stands for a unique letter. Crack all 26 codes to complete the grid — no clues, just logic.

Guess the hidden 4-, 5- or 6-letter word in 6 tries. Tile colors tell you which letters are right — and where.

A crossword where every clue is a pun or a play on words. Read between the lines — and when you're stuck, peek at the plain meaning. In Dutch and English.

Answer the clues, one word per row. The letters in the highlighted column spell a hidden word.

Hunt for words hidden across, down and diagonally. Find them all and the leftover letters reveal the solution.

Fill the whole board with the loose pieces. A few pieces are already in place, which leaves only one or a few ways to finish. From a 5×11 board up to 7×11.

Number series, analogies, syllogisms, magic squares and Raven-style matrices. Take a 20-question test or practise by topic.