undertale name screen secrets i found tonight:
- Frisk gives a warning and satrts hard mode.
- 'Gaster' instantly restarts the game.
- Typing teh names of some main characters gets a funny reaction or an outright refusal.
the hard mode is short, it ends patrway through the first area, but its a neat surprise. there are many more name reactions, and some of them hint at deeper story details. dont spoil yourself too much if you havent finished teh game yet.
