Here are the walkthroughs and riddle answers to the endings. SPOILERS

RIDDLE ANSWERS -> Spider, sponge

1. BAD ENDING -> Type in literally anything else in the answer boxes and you'll get it.

2. WILLIAM ENDING -> Answer spider, then sponge, then taft when prompted to answer.

3. REVENGER ENDING -> Answer spider, then sponge, then leave the answer blank on the last one. DO NOT PUT IN A SPACE.