NOTICE!
After level 2 all levels 3, 4,5 and "execute plan" (=complete game) will all become available.
This is due to some problems with levels 3-5 which will happen if you dont have fast machine enough and that have good chance of causing you a crash bug.
This way slower machines can play just levels 1 and 2 and complete the game, and faster machines can try levels 3-5 as well.
Notice, that to play later levels, you do need to play them in order too, since otherwise you have only 10 robots in levels 4 and 5, which is simply too little.