CrissWord: GRID is a free daily word puzzle like a crossword, but all the words go across — and letters in each column always match. Solve one row and the letters ripple through the grid. New puzzle every day.
CrissWord: Full Circle is a free daily word puzzle where you trace a chain of word transformations — from the first word to the last, where both ends always share the same category. New puzzle every day.
CountUp is a free maths puzzle game for iOS and Android. Combine number tiles to hit a target total — but it's a running calculation, not standard BODMAS. Great for improving mental arithmetic.
CrissWord is a free daily word puzzle game — like a mini crossword where two clues share common letters. Play in your browser or download the app. As featured in the Guardian.