Lens of Truth

The Lens of Truth show you hidden things [ie: bombable walls
etc..] also it requires Magic if enabled, if not enabled, it uses
Rupees.

If you have a certain quest rule checked, it allows the player to see what item is needed to solve a puzzle.

The lens also allows the player to see secret flags 16-31 before the secret happens, which is how you make invisible spike rooms and such.

Invisible spike rooms?

Actually, yes, you can do that too. 😊

Make another copy of the combo that you're using as your floor, and give it the damage amount property that you want. (I.e. damage 1/2, damage 1, damage 2, damage 4, .. any of those.) ... Now make flag #16 in the secret combo area (Data-->Secret Combos) the combo WITH the spikes showing. Now place that flag over anywhere in the room where there will be invisible spikes. Now press "F" to see the flags, and place that new combo you made anywhere where there's a Flag #16 combo that you placed.

Now, when you use the Lens of Truth, you'll see flag 16, (Assigned to the combo with the spike pictures.) wherever there is a damage combo.

shweet!!!!

Just make sure you don't have a way to enable a secret on that screen, otherwise all the spikes will appear.