1st:u got to read and memerize or just write it on a peace of paper the instructions itll say them on the wierd block in the room
2nd:use the teleporter to get the other piece of diamond then go back to wheres theres 3 diamonds and 1 in the middle its colorful u cant miss it then place the diamond u have on the empty space(just press enter)
3rd:in the place where theres a star in the way dont worry about dying just try and get pass it and when u do activate these colors in this order red,blue,light blue,and purple.
4th:in that black door use the code: rjm (itll open by itself and then u can go get the water boots to get the blue key)
if u dont get it email me or sumthing on newgrounds good luck XD