The Old Castle Defense is a play-to-earn (P2E) game, where players fight battles and sieges staking their Terrible Creatures and Knights of the Kingdom NFTs, and are rewarded with $SPH and $TON coins for victories. Investors are the third party of participants who can change the outcome of battles by investing in any of the teams, buying attacks, and saving NFTs from death. All funds from investors are going to the treasury of both teams. The winning team wins the whole treasury of the losing team. Winning team treasury refunds back to investors with rewards.