Pattern Sort
Four letter patterns, two pronunciations each: ea as in feet or as in bed, ow as in ouch or as in go, oo as in pool or as in look, ou as in ouch or as in cup. Words arrive one at a time and you put each into the bucket that matches how it actually sounds. It is two buttons — tap them or use the number keys — not drag and drop.
A game is three rounds of eight words, three of the four patterns per game, with the correct bucket named immediately after each word. The results break your score down by pattern, which is the useful part: almost everyone is fine on one pattern and quietly terrible on another.