Captain Toad: Treasure Tracker [decrypted] 3ds - ...

: The secret final level. It is unlocked only after collecting all 204 Super Gems and completing every bonus objective.

: Some bonus objectives were changed due to hardware limits (e.g., "Found the hidden Gold Mushroom" instead of clearing with 4 characters). Completionist & Secret Content Hidden Levels Captain Toad: Treasure Tracker [Decrypted] 3DS ...

: Beat all challenge times for every level to earn "Glittering Stars" on your book covers. Collectibles & Secrets : The secret final level

: The 3DS version is capped at 30 FPS , compared to 60 FPS on the Wii U and Switch. Captain Toad: Treasure Tracker [Decrypted] 3DS ...

: Pixelated Luigi sprites are hidden in specific levels like Plucky Pass Beginnings and Double Cherry Palace.

Are you trying to troubleshoot on an emulator?