Out of curiosity I checked out this Forbidden Memories game, since I've been wanting to play a yugioh game from the era where I still gave a shit about it. Had tried some of the gba titles but the interface is clunky as hell in them and I couldn't even figure out something as simple as building a deck. Which is more reasonable in Forbidden Memories, butttt some big mechanic that changes the entire card game is thrown in there. You can fuse cards, but not like the normal way with polymerization. You can merge any cards at once, but they apply to literally any type of monster card and there's nothing that'll tell you what fits with what.
So you basically need a gigantic pdf to ctrl+f with every single time you get a new card, cross referencing with each of the other cards in your hand or field one by one to see if it gives a result. If they don't match, it just discards one of them. And there's over 700 cards in the game, so the only way to to do a blind playthrough is to just mash cards together and hope they stick, and if not you're screwed. The characters don't even bring up the central mechanic of the game in the dialogue scenes, but at least it shows your opponents doing this to you. There's an early duel with Kaiba that REALLY feels like it's meant to be a hopeless battle in your first run, I expected it was supposed to be a humbling moment where the characters, you know, teach you what you're supposed to know afterwards. But nope, just mash cards together or look pairings up if it's your first time through
Clearly I should've known better, I knew this game must've been autistic as hell if Chibi latched onto it so hard