you're having problems to access Zulag2 simply because you cnannot do this right now. You have first to scape from rupture farms, learn more about the mudokon histiry, pass a few tests, thaen you will be ready to face zulag 2, 3 and 4.
The exit screen of Rupture Farms is that one with the big sign saying something like "if you scape, all 28 workers will die". Use the platform to reach the top of that section, then blow the mines to the left. Get down to the lower screen and roll left.
good luck!
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