Located in the centre of the Lava Maze, the muddy chest contains various rewards. Opening it consumes a muddy key. This can be a reliable way for lower level players to make a profit. This method takes place inside the Wilderness, which means you should not bring in any items you are not prepared to lose. Muddy keys have a buying limit of 100 on the Grand Exchange, but they are relatively easy to buy since they have a high trade volume.