ah, cool. Oviously I want to further take advantage of the lock block's peremency by suggesting a combo thats similar, but doesn't take a key yet still triggers all the lock blocks on the screen. Also, a similar combo that only unlocks if a lock block was unlocked, but is unlockable any other way. Since these combos stay even in dungeons, I think this would be interesting for adding doors and such where you have to push a switch to open.

Edit: This poof animation would not be a combo, but a sprite in the simitude of the grass and bush clipping sprites. I checked both the Oracle Series and LA, and in LA, the poof animation appears over the tile exactly like grass clippings and the Oracle games, the key goes up and disappears.

You could have 2 more misc sprites, LA style lock blocks and Oracle style lock blocks, each that do their own thing. A combo for this would not be appropriate and it would make the game look less professional.