There are a few NFT games that do not require any initial investment. Here is a list of NFT Marketplaces where you may generate money.

Gods Unchained
Players are given a Welcome Set of 140 cards at the start of the game. These cards have not been manufactured. As players level up and play games, they get access to packs that contain Common Core cards. These cards are also not coined. Players may acquire Flux by winning Ranked matches. Flux is a technology that allows them to merge duplicate Common Core cards. This method generates complete cards that are added to the Ethereum blockchain and may be exchanged in the Marketplace.

Sandbox
Sandbox is a platform created by users. Through blockchain and tiny contracts, players get ownership of what they produce. Sandbox has three goods available. The first is VoxEdit, a 3D modeling program that lets users create avatars, animals, tools, and so on. The Marketplace is the second option. The third option is the Game Maker, which allows users to build 3D games without needing coding.

Jump.trade
The most forward-thinking Cricket NFT Marketplace has sold over 55,000 NFTs. The World's first P2E Cricket NFTs allow players to participate in Meta Cricket League, the most immersive NFT cricket game has launched.

Check out: https://www.jump.trade/