Click on it to collect the lantern... unless the square is still misty, in which case you first have to use a candle on it.The interface on the map is not very intuitive. I've currently got a lantern symbol sitting just beyond the first row full of obstacles. When I hover over it it has the lantern text and says rewards:1. It's not clear how I claim this reward. and it's not keen on letting me place a candle in the next row. Anyone made sense of what to do here?