Tool-assisted game movies
When human skills are just not enough

Game Information

DOS Commander Keen: Episode 2 - The Earth Explodes

  • Platform: DOS (DOS)
  • Abbreviation: CK2
  • Display name: Commander Keen: Episode 2 - The Earth Explodes
  • Goodtools name: Commander Keen: Episode 2 - The Earth Explodes
  • Game resources: GameResources/DOS/CommanderKeen
  • In group: Commander Keen

[Tier: Moons][Fastest Completion]DOS Commander Keen: Episode 2 - The Earth Explodes (v1.31) in 04:59.79 by turska.
JPC-RR movie (.jrsr) (date: 2012-05-03)
MKV file via BitTorrent (Modern HQ) (size: 9.01 MB, length: 06:34)
MP4 file via BitTorrent (Compatibility) (size: 16.96 MB, length: 06:34)
Mirror archive.org (MKV Modern HQ)
Mirror archive.org (MP4 Compatibility)
Watch on (www.youtube.com)
Submission #3585 — Author's comments
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Rating: 7.3 (17 votes)
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- Heavy luck manipulation
- Genre: Platform
Commander Keen 2: The Earth Explodes (1990) is the second game in the Commander Keen saga. In it, the Vorticon mothership intends to destroy Earth, and only eight-year old Billy Blaze, as Commander Keen, can save us.

Here the author beats back the Vorticon invasion in slightly under 5 minutes, leaving one to wonder why we here on Earth bother with military defense at all. It's not quite that easy though; reading the author's comments is recommended to understand the planning and manipulation required for Keen to waltz by Vorticon after Vorticon.

If you enjoy this movie, check out these other Commander Keen TASes, all by the same author.

Commander Keen 1-3

The ceiling pogo glitch

When Keen is approaching a tile from below, he can avoid collision and enter the ceiling under certain conditions.


The RNG is seeded from the initial RTC time and only invoked when randomness is required. Having critters that behave randomly on-screen is the only way to advance the RNG. These include pink robots and all Vorticons.

Commander Keen 4-6

Tricks all three games have in common

Impossible Pogo Trick

Tapping ALT and CTRL near-simultaneously while holding Left or Right allows Keen to perform a humongous pogo jump.

Continuous Vertical Pogo

When approaching a static soft platform from below under certain conditions, Keen can land on it without having to wait for gravity to deplete his vertical momentum.


Landing on corners and hitting them in midair can slightly boost Keen forward.

Slope mechanics

Keen moves forward 7/6 times faster when traversing a downward slope. When traversing a sharply downward slope, he moves forward 1/3 times faster. Conversely, he moves forward 5/6 times slower when traversing an upward slope and 2/3 times slower when traversing a sharply upward slope.

Death flag glitch

Saving and reloading a game causes the "you are dying" flag to be reset while still leaving Keen in the dying animation, allowing him to clip through walls. This is beneficial when done near the vertical edge of a level, as touching one will complete the level. Oracles and swimming gear cannot be touched with this glitch.

Midair Pogo

Pogo activation and deactivation in midair allows for greater control over jump height. Keen's pogo hitbox is shorter than his jumping one, which can enable him to jump farther and higher in constrained spaces.

Tricks exclusive to Keen 4

Tricks exclusive to Keen 5

Warp glitch

Being pushed under certain conditions, including while hanging onto a pole, causes the end of the level to warp you to the game's secret level, Korath III. This is useful as the exit from Korath III takes you to the segment of the overworld just prior to the second last level of the game (as the exit to the secret level is in that level), meaning, if it's done early enough, you can skip a considerable number of levels. This glitch only works in v1.4 of the game.

Luck manipulation

Initial Shockshund positioning and Shikadi Master behaviour can only be manipulated by changing the initial seed through adjusting the initial RTC time. Volte-Faces seem unmanipulatable.

Tricks exclusive to Keen 6

Bullet collision abuse

In Commander Keen 6, the Neural Stunner's projectiles have the same collision property as the Gik. Because of this, Keen can stand on bullets.

Impossible Bullet Trick

When standing on top of a Neural Stunner projectile until it disappears, the game becomes confused as to where the bottom of Keen's clipping box might lie. When Keen fires a second shot that's in the same vertical column as he is, the game thinks Keen is standing on it and clips him there.

Keystone carryover

In Keen 6 v1.0, acquired keystones aren't cleared when exiting a level.