Counter-Strike 2
Almost everyone owns it, and it has card support — but as a free-to-play title, drops depend on money spent in-game.
Card farming
Best games to idle for trading cards
Idling is only worth it on games that actually still owe you drops. Here's how the allowance really works — and which widely-owned titles are usually worth pointing an idler at.
Team Fortress 2
Free to play with card support; drops are tied to spend rather than pure playtime.
Dota 2
Another near-universal free-to-play library entry with cards gated behind spend.
Terraria
A paid game most people already own — paid titles give their full card allowance on playtime alone.
Rust
Paid, card-enabled, and frequently already in the library of anyone farming drops.
The Witcher 3: Wild Hunt
Paid single-player title that is very commonly owned and drops its full set by idling.
How the card allowance actually works
Every card-enabled game grants a fixed number of card drops — usually about half a set — and that allowance is consumed once. Idling a game you have already farmed produces nothing at all, which is why "best games to idle" really means "games that still have drops left for you."
Paid games release their allowance on playtime alone, so idling works perfectly. Free-to-play games also have cards, but their drops are earned through money spent in the game rather than hours played — idling CS2 or Dota 2 forever will not produce cards by itself.
On a limited account — one that has never spent around $5 on Steam — drops are withheld until a game reaches roughly three hours of playtime. That is a one-time warm-up per game, not a permanent block.
Because Steam lets you report up to 32 games as running simultaneously, the fastest approach is to idle many unfarmed games at once rather than one at a time.
Let Boostr work out which games still owe you cards
Boostr reads your badge pages, finds every game with drops remaining, and idles them for you in the cloud — handling the three-hour warm-up on fresh accounts automatically. Your PC stays off.
Farm cards free