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for some reason, that trick never works with me. i can't throw them on top of hills or long distances or anything. <img src="/ubbthreads/images/graemlins/cry.gif" alt="" />

Some hills are marked as no-go zones. You can't put anything there. They're generally places that you can't go to anyway. One trick I found to detect no-go zones in to walk near hills in the dark. The light from your lantern makes strange patterns around the inside edge of the hill. Try the ones in the graveyard or Dark Forest.