Is there a FREE multiplayer game similar to Rust?

I saw ONE vid of Rust, and instantly fell in love. There's just one hurdle, it is a buy.
I want to play a free multiplayer game close to how Rust plays.
Please, if you know one (That isn't Minecraft) answer this please!

Added (1). How the hell is ROBLOX similar to Rust in any way? ROBLOX is a building game. ROBLOX dosen't have pepole trying to kill you. (I like the thrill).

Added (2). HOW DO I KNOW? I play it AND i even have TWO best friends.

Added (3). If you want to know my username, its AmnesiaMaster28 (obvious reasons)

Added (4). I already play TF2.

Added (5). You might not think its good but i might!

Maybe Roblox. Roblox is very simular Rust. Iv never played it but its pre fun!

No, there isn't a free game similar to Rust. Roblox could be similar in the sense that people make games that let you survive. Save up that $20 or move on.

I can't help you with a game like rust, but if you want a ******* brilliant multiplayer game for free, give TF2(Team Fortress 2) a go.

It can't be good and free, you need to pick one.

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Minecraft