MatheMagicans scenario is a greenfoot world in the size of your screen. Here you got a normal greenfoot world and a fullscreen panel. The difference is that a biger greenfoot world is only completely visible when you export the scenario. Here you got the greenfoot frame and another frame that is a real fullscreen frame with no decoration (no minimize, close buttons). The frame is on your whole screen. You can try this if you download this scenario and change one of yours to a fullscreen project or download my Greenfoot Full Screen Demo scenario where a simple fullscreen game is already included.

Oh shit that was the wrong scenario. Sorry I thought this was my Full Screen Demo scenario. (they look very similar). To your question: You can open the scenario with greenfoot. If you start it offline there will be a new frame coming up where you can enter the path of your scenario you want to change. Then you just click on the rewrite directory button and your scenario will be rewritten into a fullscreen scenario. You just have to make your world a subclass of FullScreenWorld and change the constructor. But I'll change this in the next version of this scenario so you don't need to do anything yourselves.

Every greenfoot project that is changed to a fullscreen project can be opened with greenfoot. In this case you can download the scenario, start it and click on the screen to start a fullscreen game (a very simple one).

Maybe thats because of your internet connection. Try to download the game maybe that it'll work better. Or if it doesn't work better offline just choose a higher scenario speed.

I didn't thought the game was that fustrating. I know the four switches in the first level are hard but a puzzle game was the condition for the challenge I did this game for. (To help you with the four switches: they have to be activated in a specific order. I think the order was 2, 4, 1, 3.) But I don't get why it took you about half an hour to get to the first switch. I think that part was pretty easy. The rocks are a bit tricky but the enemys aren't that dangerouse so the only difficulty are these rocks or lava. Therefore I didn't use animations for them. Thanks for all this advices. I'll try to change the levels so that they aren't that fustrating anymore. But I think I'll have to work on another game for the current challenge first so that may take about two weaks.