Are sets 00 and 01 impossible? In set 00 the grappling hook can't be found. In set 01 the grappling hook is found in the room with many spike pits, but the pits can't be crossed without already having the grappling hook. The jump shoes are similarly unreachable without already having them.
Thanks for pointing this out! The error is actually with how the backs match up for the Discoveries and Items. Right now it's matching Item 01 (Jump Boots) as Discovery 02 and Item 02 (Grappl'n Hook) as Discovery 03. This makes solving it impossible, as you said. I'm going to fix that right now.
They should really fire the quality control person on this game!