Paramite Abe is right. That upper screen, with a trap door and three bombs can only be reached if you are looking for the bad end (saved less than 150 muds).
There is no mudokons there. You probably missed one somewhere.
Levels (number of mudokons)
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Necrum Mines (75)
Necrum (+5 = 80)
Mundachee Vaults (+14 = 94)
Mudomo vaults (+5 = 99)
Back to Necrum Mines (+5 = 104)
FeeCo Depot (+3 = 107)
On the way to Bonewerkz (+5 = 112)
Bonewerkz (+31 = 143)
On the way to Barracks (+0 = 143)
Barracks (+49 = 192)
Feeco Executive Office (+10 = 202)
Back to Feeco Depot (+3 = 205)
On the way to Soulstorm Brewery (+5 = 210)
Soulstorm Brewery (+90 = 300)
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