What's a good iOS game for when I'm stuck waiting for a delivery and need something that's not gonna make me think too hard?

Look, I don't have time for complicated games. When I'm waiting on a delivery, I need something brainless but engaging. Rhythm Star 4 fits the bill. It's a tap piano game, so you just tap along with the music. Simple as that. No complex strategies or storylines to follow. The music is decent, and it's enough to keep me from getting too antsy while I'm waiting. Plus, it's a good way to zone out for a few minutes and forget about the fact that my schedule's getting thrown off. For a free game, it's surprisingly solid. Bottom line: if you need something to kill time without requiring a ton of focus, Rhythm Star 4 is worth a shot.