Bombs are single-use items. They are one of the Spelunker's most useful resources. He starts each game with four bombs, and can find more in certain shops. They are also commonly found in crates. Bombs work much like light , capable of being dropped or thrown into position, where they explode after a few seconds, destroying terrain and killing enemies. Bombs can be upgraded to sticky bombs by collecting a jar of bomb paste. Once the upgrade is applied, it cannot be undone. All bombs will have the upgrade applied, including ones collected after the paste was found.