I would like to ask if there is a command that will restart the game. Let the game start completely from the beginning.

I though that maybe this can be achieved with a while loop in the main function. But this will cause the entity's to be loaded a second time. Will the engine destroy the old instance or do I need to do it manually?

I guess that you mean restarting a level not the entire game.
Look into the manual for level_load.
level_load destroys all entities within the current level, while loading the given level in the brackets.

There are no common patterns that deal with "restarting" a game, because a game is so much more than a level that can be re-loaded with level_load. If that is your case you have to reset e.g. all your variables to the state they are at the beginning. Also, if your game is embedded into a menu structure, take this also into account.

Don't laugh at me but making a level work is imho a piece of cake compared to making a full retail-like game of it and especially re-starting the game as a whole and/or in parts is an issue which can be quite a difficult task, sometimes.

So, please describe your problems and issues so that we can just point you into the right directions.

the best solution I've seen is to save the game after everything is loaded then if you need to restart load that save file

mrguest. You are a genius. Didn't think of that. That is the perfect solution. Thanks. Its a small one level game for a school project and I need a way to restart the game after the player has lost.