Build it. Test it. Learn from the boom. Reach Mars.
El0n is a made-up character in a friendly parody. All companies here (Rocket Rascals Co., Volt Motors, Not-So-Boring Tunnels, StarString) are fictional.
Your name is yours alone: the first time you play, the server gives this browser a secret key for it. Saves and scores are kept on the server and checked there.
Move: north, south, east, west, up, down, in, out (or n s e w u d). Look: look, examine X, search X, read X, inventory (i). Act: take X, drop X, push X, pull X, use X on Y, give X to Y, talk to X, ask X about Y, sign up, test X, launch, fly, think, wait. Build: builds, assemble X. Puzzles: use the Puzzle panel, or type the move (for example patch fin 2 or bore a1 b1 ...). Stuck in a dead end? recover. Story: hint, journal, lessons, map, score, undo. Saves: save [slot], load [slot], saves, delete slot. restart starts a new game. Up and down arrows recall earlier commands.