The explosion ending is random (30% chance)
For the other endings, place a cup, a plushie or a cup in the box.
The true ending triggers after getting all these endings
ohhh, alr, thanks!
Besides the one near the plant, where is the other cup? I can't do anything to the plant or pens....
It appears to have been a mistake in the above comment, the three objects are the cup by the plant, the plushie, and the scissors on the desk.
