One hundred 5×5 mini crosswords, from easy to hard. Ten clues each — across and down cross-check every letter, and every answer gets its own colour on the grid.
How to play: tap a square to start, then type. Tap the same square again to switch between its across and down answer. Arrow keys and Backspace work as usual; Tab jumps to the next clue. Check marks wrong letters, Reveal fills in the answer you are on. Answers are colour-coded: a square shows the colours of both answers crossing there, so the entry you are typing is easy to follow.