Neutral Route:

1. In Frisk's new room, turn off the light and Snas should be behind your bed. Creepy.
2. In the room where the spaghetti save is, instead of spaghetti being on the table, there will be a Snas.
3. In the hangout with Papyrus, interact with the sink and you will find a Snas.
4. Look through the telescope in Waterfall, in the bottom right corner, there will be a Snas.
5. Directly after the room where Undyne throws spears at you, in the save room that usually has crystallized cheese in it, a Snas will replace the cheese.
6. Get a Punch Card. Open the Punch Card. There will be a Snas.
7. Simply do not skip Onionsan. He is a Snas.
8. Get an umbrella. Put the umbrella on the statue in the previous room. Asriel will become a Snas.
9. Lay down with Napstablook. When you ascend into the next plane of existence (stars appear) a Snas will appear. 10-11. Go to the Temmie Village and go to the right. There will be a Snas statue and Snas will be peaking through the wall.
10. Get a game over screen, Snas will be in the "O" of "Over".
11. The vegan substitution in MTT's cooking show is a Snas. 14-15. Rent a hotel room in the MTT Hotel. Two Snases will watch you sleep. Once again, creepy.
12. Asgore sits on Snas' ass all day. (Asgore's throne has a Snas on it).

True Pacifist Ending:

1. Interacting with Undyne's... bone thing stash ... will make a Snas appear.
2. Ever wonder what that thing in the bathtub in the True Lab was? It's a Snas.
3. Ever wonder what that thing that tucks you in in the True Lab was? Surprise! It's a Snas.
4. Even the fucking sun is a Snas. (End of TPE).

Genocide Ending:

1. Snas replaces Chara at the end of the Genocide Ending.