Stuck at the start of Level 7 .... There are crystals blocking the way to the right and I don't have the mirror shield yet, and to the left of the entrance is some kind of trigger switch. I have nothing that will activate that switch. Did I miss something along the way? The last thing I picked up was flippers, and have the level 2 for sword and armour ... please help, I am not going further till I get something for that switch!
Right at the beginning of Level 7, there should be a key surrounded by a lot of water. When you get that, go back to the floor where you got the Flippers and unlock the door that's been surrounded by water, then continue from there. You'll get the Mirror Shield soon to hit the crystal switches.