Degenerus is an on-chain lottery with a lot of moving parts. Each page explains one in about two minutes: what it does, the contract numbers, and the risk. Ordinary ticket and lootbox ETH routes into game pools without a purchase-time rake; the rules live in immutable contracts you can inspect.
The whitepaper gives the overview. The game-theory paper explains the incentives, assumptions, and failure modes.
Whitepaper Game Theory Play