The concept of "play-to-earn" games, particularly those leveraging blockchain and NFT (Non-Fungible Token) technology, has gained significant attention. While the landscape is continually evolving, here are some popular play to earn games that were making waves in the USA:

1. Axie Infinity: Axie Infinity is perhaps the most well-known play-to-earn game, where players collect, breed, and battle creatures called Axies. Players can earn the in-game cryptocurrency, Smooth Love Potion (SLP), by participating in battles and completing various tasks.

2. Splinterlands: Splinterlands is a digital collectible card game where players build decks of cards representing various creatures and spells. Players can earn the in-game currency, Dark Energy Crystals (DEC), by participating in battles and tournaments.

3. CryptoBlades: CryptoBlades is an RPG-style game where players engage in battles and quests to earn skill tokens, which can be staked to earn cryptocurrency rewards.

4. My DeFi Pet: My DeFi Pet is a blockchain-based game where players collect, breed, and trade virtual pets called DeFi Pets. Players can earn rewards by participating in battles, quests, and other in-game activities.

5. Alien Worlds: Alien Worlds is a decentralized metaverse where players can mine resources, participate in governance, and engage in battles to earn Trilium (TLM) tokens.

6. Townstar: Townstar is a city-building game where players can earn cryptocurrency rewards by constructing and managing virtual towns.

7. The Sandbox: The Sandbox is a virtual world where players can create, own, and monetize their gaming experiences using NFT assets. Players can earn rewards by participating in various activities within the metaverse.

It's essential to conduct thorough research and exercise caution when participating in best play to earn games usa, as they often involve financial investments and risks. Additionally, the regulatory landscape surrounding blockchain-based games and cryptocurrencies may vary, so it's crucial to stay informed about the legal and compliance requirements in your jurisdiction.