Go up the stairs on the left.
If you like, you can shoot the eyeballs on the columns, but this doesn't yield points or gems, just some viscous, green goo.
Use a remote bomb to destroy the giant eyeball sticking out of the floor.
Doing so turns off the poison vents near the glowing sphere and extends a bridge back to the starting area.
Go back downstairs and roll the ball across the bridge.
When you reach the area where you found the flamethrower earlier, another swarm of scarabs attacks. Deal with them.
Then roll the ball past the first switch and into the round cage to open the gate next to it.
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