Pool2Play is a concept for decentralized game allowing to accept players only when they have staked to a subscription pool.
In decentralized games, there may be lots of transactions and paying fees can be really annoying for players and its an issue for on-boarding mass users.
The pool itself can be used with DeFi services to generate interests. The profits can be used to supply a GasRelay to pay the fees for in-game transactions.
However to realize this Pool2Play concept, we face the issue where the game's contracts and the pool contract are deployed on two different blockchains.
Using Tellor oracle platform with the proper improvements, we've managed to create the link between 2 different blockchains.
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We've used Portis in the front-end because it's a very convenient wallet to onboard new users (do not require Metamask, just an email) and it's able to switch seamlessly between 2 blockchains (with the same account).
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We've used Tellor (of course) with an extension of the oracle interface (ITellor.sol) to allow the request to be parameterized: in that way we're using a unique requestId to retrieve the balance of any account of any ERC20 contract of the targeted blockchain (the account and the token address are the parameters of the request).
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Finally we've deployed the game and the oracle on Binance Smart Chain (testnet) and the token to Ethereum Goerli to demonstrate the mechanism.
We've chosen the famous 'Rock Paper Scissors' game (with commit/reveal) to illustrate. The concept can, of course, be generalized to any kind of game.