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Grinning Cobossus

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Addicted 5 Points

Load up the game five times

Don't leave yet! 5 Points

Click "more games"

Nope, not a walkthrough 5 Points

Watch the video

Pressin' F5 5 Points

Load up the game two times

5 Minutes to kill yourself 10 Points

Play for five minutes

Whining Cobossus 10 Points

Beat the game on easy difficulty

Malicious Joy 25 Points

Score 35k in survival mode

Now you're a hero 25 Points

Beat the game on medium difficulty

This is actually fun! 25 Points

Play for half an hour

Double Kill 50 Points

Score 100k in survival mode

Easier with a rope 50 Points

Beat the game on hard difficulty

Ultimate Assassin 100 Points

Don't get hit on "hard"

Author Comments

Grinning Cobossus is a shmup that only consists of one epic boss fight, but it features 3 difficulty modes, survival mode, 12 achievements to earn and a lot of fun.

v 1.09 Added a 3-seconds delay after unpausing the game

v 1.08 Various bugfixes, mouse is now centered on the ship, also fixed a bug that occured in survival mode

v 1.05 Fixed health regeneration issue. Also, scores in survival mode are updated each time you hit the boss, the score won't be ignored when quitting via the exit to menu button.

v 1.04 You can now suicide by pressing the "9" key two times in case you wanna quit survival mode. (It won't save the score unless you die)


Mouse - move (mouse controls)
Left mouse button - Shoot (mouse controls)
WASD / arrows - move (keyboard controls)
X / L - shoot (keyboard controls)
F - toogle autofire
K - toggle keyboard controls
Space / P - Pause
M - mute all sounds

The game's a pun on the legendary flash game "You have to burn the rope". The Grinning Colossus was used with mazapan's permission.

Feel free to leave feedback, especially since it's my first flash game. I'm open for suggestions and tips, but also bug reports.

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very fun 👍👍👍

Now I'm a hero!

It's OK but, really it's just repetitive. Adding different bosses for different difficulties would be great, I just found playing all the way through and 100%ing the game didn't do much for me. It was just getting some XP and the thought of acomplishment.

Quite enjoyable and challenging on hard (there are tons of much harder bullet hell games out there) , but, frankly, also gets repetitive quickly.

Rule of thumb is to dodge, saving upgrade points from "armor" to invest elsewhere.

Also, where are the hiscores tables?

white screen

Credits & Info

4.16 / 5.00

Oct 19, 2011
12:05 PM EDT