unexpected restrictions are the best way to unleash the creativity

It's the beginning of the summer here, so no rain for us. But, if rain is the issue, how about these ideas from the top of my head:
- skill: collect raindrops to pour on flowers to grow
- a platformer: try stay as dry as possible while collecting seeds while raining
- puzzle: try to fill a cup with water by collecting a rain from a single cloud using pipes and hoes.
Anyone have another idea?