Trial and Error Based Gameplay

[psychospacecow]

A poster boy for this entire discussion would be Yu-Gi-Oh! Forbidden Memories. You always have 5 cards in hand. You can select cards to fuse them. If they don't fuse, the first card just dies. If they do fuse, you might not like what you get. The final boss is actually a string of about 5-8 boss fights in a row without save points. Every single one of them can summon the strongest monsters in the game. Every match that you win gives you a random card. If you can't summon a stronger monster, you either draw into Dark Hole, Raigeki or lose. The game snowballs faster than a ball of shovels rolling down a mountain in Alaska. Everything is a coin flip. Even the deck you start out with is random.

The fastest run for Forbidden Memories was 3 hours 29 minutes and 27 seconds. Most runs I've seen run for at least a day.
http://www.speedrun.com/Yu-Gi-Oh_Forbidden_Memories
http://www.twitch.tv/theurnator/c/4304064