To be honest, there aren't many projects that can be played for free and still produce stable cryptocurrency rewards. FOMO is one of the more trustworthy ones I've seen recently. It's an on-chain guessing game deployed on Telegram; you can just play directly.

By betting 1U, regardless of winning or losing, you can receive a fixed amount of 100 FOMO tokens. Predicting equals mining. If you win, you can also get extra USDT.

If you don't want to spend money, you can also play for free by completing a few tasks or inviting a few friends; you can make three free bets every day, so accumulating tokens isn't slow.

The project is still in its cold start phase, and it's really generous. If you don't get in now, the threshold and costs are definitely going to be higher once it heats up later. So, I recommend trying it out first, especially the free aspect, which is very stable.