Broad questions! In short, yes and no - there are ways to play these games for free, but also it may be reasonable to expect to have to pay a fair bit to play them seriously. ​ For Axie Infinity, you'll need to own at least three Axie NFTs in order to play the game. The good news is the price of Axies has dropped dramatically in recent months, and now you can buy an Axie for just $5, so $15 should be enough to get started. ​ Not quite free, but not terrible either! ​ ​ Unfortunately, what this means is earnings aren't super high either. According to one person who spend a week playing Axie casually, they made ~$10.28, and invested $800 in playing the game to begin with: https://medium.com/coinmonks/how-much-money-i-made-playing-axie-infinity-for-one-week-6b865ba0548f ​ Earnings are even less now, so unless you're an extremely serious player, it's pretty difficult to earn a living playing Axie. ​ Earning potential in The Sandbox is a lot more varied - you can earn money from renting out your land, or creating unique items and selling them for SAND, or even building games inside The Sandbox and charging people for playing them. ​ Making items to sell to other people is free and there's no cost, but your ability to actually make money from doing so will naturally vary. ​ To make a game and monetize it, you'll need to buy land to host your game, and that will be fairly costly - the cheapest plot of land goes for 1.6 ETH at the moment: https://opensea.io/collection/sandbox ​ So in short - while you can play The Sandbox for free as well, owning land certainly doesn't come cheap, and you'll have to put in quite a bit of work to make money here. ​ Hope that helps! ​