2048

Slide numbered tiles around a four-by-four grid and merge matching pairs to build bigger numbers. Every move shifts the whole board and drops a new tile, so the grid fills relentlessly and the challenge is keeping space free while you work toward 2048. It looks trivial for the first minute and then quietly turns into a game about planning three moves ahead. Most people lose their first several attempts in under two minutes, which is exactly why it is hard to walk away from.