"Hellbender features similar gameplay to Fury3 and Terminal Velocity. The player is in control of a space craft (the 'Hellbender') and must fly it around a map, destroying various targets and reaching checkpoints. There is a large selection of weapons available, including the Valkyrie cannon and the Sledgehammer rocket. Many more weapons are available by collecting power-ups during gameplay.
The levels in Hellbender are composed of a few missions that take place on various planets. There are typically 3 to 4 missions per planet.
Source: Wikipedia, "Hellbender_(computer_game)," available under the CC-BY-SA License.