I recently release a fully on-chain match 3 puzzle game as NFT (called FOCM3). All in ERC-721 contract, everything is on-chain and tokenURI() takes under 30M gas.

I published also an article with technical details how this was implemented. Here:

I recently release a fully on-chain match 3 puzzle game as NFT (called FOCM3). All in ERC-721 contract, everything is on-chain and tokenURI() takes under 30M gas.

I published also an article with technical details how this was implemented. Here: https://medium.com/@eto.vass.art/fully-on-chain-nft-game-the-technical-story-of-focm3-ec291a1b87ff