to do lvl 30: first let the arrowed blocks begin to explode
when they are exploding, use the new passage at the top that was blocked by "stone" walls. If the grenade that you throw in the upper pipe arrives earlier than the last arrow block, it's good. Else retry. Then trhrow another grenade in the upper pipe and you won. (if youwant you can also explode the bonus block :P)
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