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Each door has its own colour and you must find the key that has the same colour, first,  you must find the yellow key, once found, press F to pick up the key and G to drop it off next to the gate, you will see it right on the wall.

next, there is a purple and red door that you have to open, find the red key. open the gate.

The final step is to find the purple key, once you get to the green light you have passed the first level!