Ym modd llym, ni chaniateir dadwneud, golygu, neu amnewid tyllau. Defnyddir hyn fel rheol mewn cystadlaethau. Cedwir sgorau gorau ym modd llym yn unig.
In strict mode, undo, editing, and switching holes is not allowed. This is generally for competition. Only in strict mode are highscores kept.