Descent

Levels

 * Earth's Moon
 * Level 1 - Lunar Outpost
 * Level 2 - Lunar Scilab
 * Level 3 - Lunar Military Base
 * Venus
 * Level 4 - Venus Atmospheric Lab
 * Level 5 - Venus Nickel-Iron Mine
 * Mercury
 * Level 6 - Mercury Solar Lab
 * Level 7 - Mercury Core
 * Mars
 * Level 8 - Mars Processing Station
 * Level 9 - Mars Military Dig
 * Level 10 - Mars Military Base
 * Asteroid Belt
 * Level 28 - Asteroid Secret Base (accessed from Level 10)
 * Level 29 - Asteroid Military Depot (accessed from Level 21)
 * Level 30 - Asteroid Robot Factory (accessed from Level 24)
 * Jupiter
 * Level 11 - Io Sulfur Mine
 * Level 12 - Callisto Tower Colony
 * Level 13 - Europa Mining Colony
 * Level 14 - Europa CO2 Mine
 * Saturn
 * Level 15 - Titan Mine
 * Level 16 - Hyperion Methane Mine
 * Level 17 - Tethys H2O Mine
 * Uranus
 * Level 18 - Miranda Mine
 * Level 19 - Oberon Mine
 * Level 20 - Oberon Iron Mine
 * Level 21 - Oberon Platinum Mine
 * Neptune
 * Level 22 - Neptune Storage Depot
 * Level 23 - Triton Storage Depot
 * Level 24 - Nereid Volatile Mine
 * Pluto
 * Level 25 - Pluto Outpost
 * Level 26 - Pluto Military Base
 * Level 27 - Charon Volatile Mine

Shareware Differences

 * No sound for Invincibility Pickup
 * Different sound for changing weapons
 * Different sound for gaining Extra Life
 * Different instrumentation on music tracks
 * No music track for escaping a mine
 * No intelligence report for Class 1 Driller
 * End briefing after Level 7
 * Levels 6 and 7 reuse music tracks from level 1 and 2 respectively
 * Weapons you already possess cannot be picked up for ammo
 * Screencaps of registered version
 * The Plasma Cannon, Fusion Cannon, Smart Missile and Mega Missile are not available