On ryluss the second planet you plant the first explosive plant with the sprout-o-matic hit the bulb with the wrench while in front of the plant hit it backwards and... You have the sludge boots
On the second level, on the first mimic plant go to the side (right hand) and use the omniwrench. It will break a crevice open with the boots inside.
In ryllus, right after you planted the first explosive plant, aim it to the left wall, and it should explode. The sludge mk. 9 boots are in there.
you win all the skyboard races on medical outpost and to get sludge boots you beat all the skyboard races on kalidon
The strongest armour in ratchet and clank size matters is the stalker armour. You will need wildfire helmet, Chameleon Body Armour and Boots and Sludge Mk.9 gloves.
All the armor does on ratchet and clank is decrease damage taken. some armor is 10% some is 65%+.
Beat the last skyboarding race on Kalidon.
You win all the gadgebot challenges in the clank challenges (it's on dayni moon)
to get the sludge mk9 gloves you need to beat the master sky boarder challenge on kalidon. to get the electro shock boots you need to beat the master sky boarder challenge on medical center after you finish the level
Ratchet and Clank size matters have no cheats
If you mean "How do you get to the HIG Treehouse in Ratchet and Clank Size Matters and Secret Agent Clank, consult the Ratchet and clank wiki.
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No you can't