You must complete all levels to unlock custom.
Unlock all levels marble blast gold.
On level 24 of beginners level you can substitute the gyropractor which is tricky to work and instead use a super bounce to reach he tower with gems.
The location of all gems for this level are.
Beat the gold time target on every level.
Please note that if a level has moving platforms it uses interiorresource marble data directory.
Open the prefs cs file.
Then find the end pad or finish pad make sure ur right above it though then press f 8.
Scroll to the line that says qualifiedlevelbeginner etc and change that number to.
Download levels designed for marble blast gold here.
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First u press f 10 or the button under the escape key to get the cheat menue down duh then u type in testcheats 1 then if ur on a level with no gems all u do is press f 7.