You’re in the desert. Walk to the right to see a strange box.
Use the box and you’ll end up in a computer. There’s not much access other than the recycle bin (Papierkorb). Use it and find a document called ‘SECRET’. Take the DOCUMENT with you, it contains a password. Leave the recycle bin and open ‘My Computer’ (Arbeitsplatz).
There are a lot of games listed here and one is a folder in capitals: REALITY ON THE NORM. Open the folder and you’re inside another game. Inside the tree on the right you can find a PAGE with the letter ‘R’ on it. Use the exit-button to leave the game and you’re in the desert with the box again.
Use the box again and use the document with password on the ‘My Documents’ (Eigene Dateien). You can now see a subfolder and you decide to take it with you. Open your inventory and look at the ‘That Crazy World’ folder. You immediately enter that world. In front of the building is a large box. Use the box to get another PAGE, this time with the letter ‘N’ on it. Use the exit-button to leave the game and you’re in the desert with the box again.
Use the box again and use the document with password on the ‘Internet Explorer’. You’ll connect to another reality. Use the box in the alley of the bum to find a third PAGE, now with the letter ‘O’ on it. Use the pink portal on the left and everything will become clear… or not.
Game source: A copy of the game was found here on the internet.