Game Boy Color · Puzzle
Pelmanism
No ROM
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EmulatorJS (open source, GitHub) · Touch pad on phones. A Bluetooth gamepad is better for fighters and karts.
Controls
On a phone, use the on-screen pad. A Bluetooth gamepad works too.
Pelmanism is TeamKNOx's 2001 Game Boy Color version of the memory card game, also called Concentration. Turn over two cards at a time and clear all 52 by finding pairs. This ROM is hosted under MIT.
Walkthrough
Pelmanism is a redistributable open-source Game Boy Color card game. The ROM loads when you open the page. All 52 cards lie face down; remember where each one is and pick up the pairs.
Pick the game

Press any key on the title. On GAME SELECT, keep PELMANISM and press A.
Pick a level

Choose EASY, NORMAL or HARD with the D-pad and press A.
Turn a card

Move the hand over a card and press A. The card shows in the left box at the bottom.
Find pairs

Turn a second card. A pair is removed and LEFT drops by two; a miss turns both back. Remember what you saw and clear the table.
License

MIT. Source: https://gitlab.com/teamknox/gbccardgame. Commercial ROMs are not hosted.
FAQ
Is Pelmanism free to play here?
Yes. TeamKNOx released it under the MIT License, and this page hosts that ROM.
When is the game over?
When LEFT reaches zero and every card is gone. Fewer turns is a better result.
Are there cheat codes?
No published cheat pack. Save-states are in the emulator menu.
Can I play it on a phone?
Yes. The on-screen pad maps to the D-pad, A, and B. Landscape is easier.
Who made it?
Osamu Ohashi of TeamKNOx, 2001. He wrote it for his daughter. Source: https://gitlab.com/teamknox/gbccardgame
Emulator cores live on S3. A game starts from a hosted ROM when that file exists, or from a local file you pick. Local files are not uploaded.