"This field is made up of nothing but sand, with the occasional cactus. Due to living in this harsh environment, the monsters here are very strong, and there are some that can't be defeated with just bombs."
Desert Zone is the last of the zones you go to, with the Pyro Commander ruling over it. It consists of areas A5 to C8 with D6 to D8.
[D6] Beat that Jackenboxx for the Wings. If you came from C6, you can enter a cave.
[D7] You'll need the Wings to cross these gaps and those up ahead.
[D8] Crack open Hoopster for a Flame.
[C8] Nothing of interest here.
[C7] Same lack of excitement here.
[C6] You'll need to jump or fly up to that ledge, and use the Hammer for that nail. If you came here from C7, dig for an Ice Shard.
[B6] Dig on the platform for a Skull.
[B7] Win a Flame for funking up Flyball.
[B8] If you came from B8, drop down with a jump or flight, and get the Boomerang in the chest.
[A8] Pygmin will give up the Platinum Armour for being beat.
[A7] Use the Power Bracelets to move the rocks. Come here from A6 and use the Hammer to reach the stairs to the clouds.
[A6] Little Snaky here has some Poison Ivy for you if you defeat him.
[A5] Knock down the nails with the Hammer and get a Clock from the Bomberman statue by dancing at it with the !? item.
[B5] The little bugger Yeti has the Gauntlets if you play his game with him.
[C5] The entrance to the Pyro Commander's lair. Also there's a path to the beginning of the Field Zone behind that statue which'll be gone after Pyro Commander is gone. And using the Glasses, you can get an Armoured Jacket.
[A] Use the Power Bracelets to push the rock onto that switch.
[B] Fight the Crystal Demon for the Glasses. Watch out for the lava!
 Hit the nail with the Hammer to bring down the pillar. Watch out for the electricity between those generators.
 Hang up Walking Hat for the Leather Armour.
Pyro Commander's Lair
[C1] Those things shoot arrows, and there are collapsing tiles on the thin walkway, but who would use that? Just jump or fly to the next part of it.
[B1] Bring Hippity-Hop to a halt for an Explosive Core.
[B2] Coming from B1, bomb the switch to lower the pillars below, and you can only fly to the right part. When at the bottom, be very careful while on the collapsing tiles, as I too have difficulty on them. Sometimes using the Wings and attempting to land and take off on the third collapsing tile works, but sometimes I just fall through.
[A1] There are giant rolling balls here, so leap or fly over them, or use the Stopwatch.
[A2] When the switch is on, the entrance and exit are open but you can't reach the exit thanks to a middle pillar, and it's the opposite when the switch is off. Place a bomb that will turn it on, and run past the middle pillar before it detonates. Then fly to the exit.
[B3] Tinklebear is pathetic. He doesn't even have a new item, just a Flame.
[C3] This is where the Long-fused Bomb finally comes in handy. Place one, then use the Dash Shoes to sprint to the pillars and cross over them during the split second they're down.
[C4] The Shadow Knight, when done away with, gives you the Honey Card.
[B4] Boss room! Defeating the Pyro Commander will get you your last engine, an Explosive Core, and an additional unit of health. No secret boss this time.