Someone commented on my post about Devil World that what I experienced was Tetris effect. When I was scrolling vertically on my phone I would occasionally experience sideways scrolling similar to the game mechanic even though there certainly wasn’t any sideways scrolling happening.
Another one was when I was playing Portal. Traveling via portals became my usual method to move around in every dream I had those days.
Regex Crossword. Unfortunately it doesn’t have as many puzzles as the non-FOSS alternative.