Board Thread:General Discussion/@comment-27907368-20160412010659/@comment-25181180-20160421121247

Elevator Soundtrack

The sound that plays when riding the elevator to True Lab are part of the Undertale OST.

Genocide Bosses' "Special Eye"

Undyne the Undying's left eye repetitively shone throughout the battle whilst Mettaton NEO's robotic right eye can be seen shining in the form of a star. Sans' left eye glows blue or yellow when using telekinetic abilities.

Toriel's Forgiveness

Meeting Toriel in her home (in the Ruins) while having 1HP will make Toriel upset, and said that the player will get an apology.

Lost Souls' Attack

The last souls only deal 1 damage while the first souls deal 4 damage. This happens when you equip Heart Locket tho.

2D Undertale?

The only instance where the game went 2D was when walking with Monster Kid when overlooking the castle.