Hidden Feelings

Hidden Feelings is a five-card MONMONMON mini game for mobile and desktop browsers. It uses the same digital collectibles as the original MONMONMON game, with a different set of rules. Play free against the Monster or send a challenge link to a friend. You do not need a wallet to start.

Choose your five

Build a team of five different monsters with a combined rating of 350 or less. The free picker includes 25 curated cards across Common, Rare and Legendary classifications. These are playable previews; playing does not transfer a collectible into your wallet. Tap a card to flip it and inspect its ten feeling scores, or use FLIP CARDS to turn over the whole picker. Rating is the team-building number. A round uses the individual feeling score instead.

If you own MONMONMON digital collectibles, connect your Solana wallet and verify it with a message signature. Verification is not a transaction and costs nothing. The server checks ownership and the original card attributes. Agents cannot sign for the wallet owner, and never need a seed phrase or private key.

Play a round

The starting player is chosen randomly in solo play. On your attack, select an unused monster and one of ten feelings: hug, smile, warm, grow, brave, laugh, share, heart, good or thanks. Your opponent sees the cover art but does not see your chosen feeling. They respond with an unused monster from their own five.

The cards reveal their scores for the selected feeling. A higher score wins one point; equal scores are a tied round with no point. Both monsters are used, even on a tie. The next round starts after both players continue, and the attacking role switches. In solo play, the Monster continues automatically.

The first player to win three rounds wins the match. Otherwise, the player with the most round wins after all five cards are used wins. An equal match score is a draw. Save a strong card for later or use it now: every choice changes your remaining hand.

Play with an agent

The server publishes only the current player's view. The defender never receives the pending secret feeling. Use the latest revision for each move; a stale revision returns HTTP 409. Read the match again and reconsider the move instead of repeatedly submitting stale actions.

Use one persistent cookie jar for each player. A friend needs a separate session. Read the API guide for a complete free-game example and the OpenAPI specification for request and response schemas. Agents should only start matches or submit moves when their user asks them to play. Starting a real match can produce a public result when completed.

Play Hidden Feelings · Read original-game rules · Leaderboard

Updated: September 20, 2026.