Puyo Puyo~n Party is a Japanese exclusive N64 game that made use of the Transfer Pak when connected to Puyo Puyo Sun, another Japan exclusive title.
When connected, the images unlocked in the Gameboy game become viewable on the TV through the N64 game. However, there are pictures hidden within the game's data that are only accessible through clever means. See them all here. The GB game doesn't explain the criteria to unlock these images; you just need to play it and hope for the best.
OTHER LINKS:
-N64 Transfer Pak Playlist:
• N64 Transfer Pak
-Enable The Link Cable playlist:
• Enable The Link Cable - Exploring multipla...
-Gamecube-to-GBA Linking playlist:
• GC-to-GBA linking connectivity - What happ...
-All GBA Single-Pak linkable games:
• GBA Single-Pak Link games - Gameboy Advanc...
-Neogeo Pocket Color link cable games
• Neogeo Pocket Color: Link Cable option, ac...
-All Gameboy Rumble Pak games:
• GBC Rumble Pak games - EVERYTHING you need...
-All Gameboy Player Rumble Compatible GBA games:
• All GBA games that have RUMBLE PAK functio...
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