What's a puzzle game that surprised you with its difficulty?

I've been playing Block Blast on and off for a while. It starts off feeling like a simple time-killer — drag and drop blocks, clear rows, nothing complicated. But somewhere around the mid-game, the difficulty spikes in a way I didn't expect. The board fills up faster, the pieces feel harder to place, and you actually have to think several moves ahead. It's not a hardcore strategy game, but it caught me off guard. What puzzle games have surprised you with their depth or difficulty? Could be... Read more