Derivestep Mathdoku

Derivestep Mathdoku teaches you logic puzzles — it doesn't solve them for you. Instead of just revealing the answer, Derivestep explains the method behind each move: which technique applies here? Why does this cage force exactly this number? Staged hints (nudge → deduction → move) move you forward without doing the thinking for you. Mathdoku / Calcudoku is a Latin square with arithmetic cages (+, −, ×, ÷) — like Sudoku, except the cages have to be worked out. Choose size (4×4 to 9×9), difficulty, operations and help level. Play it your way. Five settings decide how much the app prepares, shows and explains: appearance light or dark, candidates pre-filled or an empty grid, help level from detailed to none at all, timer visible or hidden, highlights on or off. 240 puzzles plus a daily puzzle — over 25 hours of puzzle time, free permanently and with no ads. A fresh puzzle every day, and…