Well Guarded Plateau

This is a rather well-guarded area, isn't it? There must be more here than meetz the eye!
Twenty-three Holez , and sixteen Rock Crystalz ! Purple Multi-Grunt Switchez (PMGS)?
Somebody really doesn't want you to get to those three PMGSz ! (Me, perhaps?)

Must be some Purple Pyramidz (PP) around somewhere. Look around.
You obviously need a Gauntletz Grunt (or TimeBombz Grunt ) to break the Rock Crystalz , and a Shovel Grunt to fill in the Holez . And a third Grunt to stand on the third PMGS.
And three very nasty looking enemy gruntz standing in your way.
First thingz first … get rid of the enemy gruntz .
Are you a hand-to-hand combat specialist? What are the weaponz you have available to fight them with?

(The megaphonez will eventually get you two Swordz of your own, if you are patient.)
With two Sword gruntz and a Beach ball , here is what I would do: give the Beach ball to the enemy grunt nearest the Stairz; both Sword gruntz dispose of him and attack one of the other two gruntz ; whichever of your Gruntz gets stabbed, put behind the healthy one, and attack the other Grunt nearest the PMGSz.

Now for my way: "Use the bent wood, Luke" (or whatever).
No Boomerang ? Did you throw it away, and forget to catch it?
That was one of the very earliest Itemz called for by the (many) megaphonez !
There are placez outside the Plateau where your Boomerang Grunt can stand, and still hit two of the enemy gruntz … your task is to find those placez. 'Nuf said.