This is the third area in UNDERTALE. If you have seen the Snowdin guide, then this is the next guide. If not, please go back and read the ones you haven't read. Also, Sans has some advice about reading ahead. Don't.
Take A Break, Bro
The first area in Waterfall plays the sans. song, and as it turns out, Sans is sitting there at his stand. You're going to see him a lot during the game. If you don't talk to him, that's fine, but if you wanna take a break with him, talk with him and say yes. There is also a save point here. Save your game. There are a few puzzles that are kinda hard later on. Anyways, continue on.
A Feeling of Dread
There is a puzzle up ahead that involves falling rocks. The rocks knock you off onto a bridge, which leads back to the start. In the middle of the waterfall, there is a secret door that leads to a room with the Old Tutu. Like before, it's the best armor you can get so far. Its weapon counterpart, the Ballet Shoes, are not really useful unless you are a completionist, as well as not available until later. Continue on.
The next area is a hallway with a rocky area overlooking it. After a cutscene with Undyne and Papyrus, we now know 3 things.
- 1. Papyrus is working for Undyne against his will
- 2. Undyne is this murderous knight girl that genuinely hates us.
- 3. We are in trouble.
After walking out of the grass, a small dinosaur monster walks out and says how cool that was. Ignore him, save, continue.
Waterfall Puzzles
The next room is easy. There are 4 flowers in an area to the north. They can be used to make a bridge, which is exactly what you need. Line 'em up right, cross the bridge, and continue. The next area is the same thing. The river at the bottom right leads to a good, one-of-a-kind healing item called the Abandoned Quiche. Get it, then use the bell to respawn he flowers, make a bridge to the next room, ignore Papyrus's call, and continue.