Finish 4th level of 4th season
Finish 3rd level of 4th season
Finish the third season
Finish a hard mode level
Get 3 stars in a hard mode level
Finish 7th level of 2nd season
Finish the second season
Finish 2nd level of 2nd season
Finish the first season
Finish the first level of the Adventure Mode with 3 stars
Play with the fabulous Stickman
Finish 14th season
Finish the game
Finish 4th level of 8th season
Finish 6th level of 4th season
Finish 4th level of 5th season
Finish 5th level of 6th season?
Finish 2nd level of 7th season
Finish 5th level of 7th season
Finish 5th level of 9th season
Finish last level of 10th season
Finish 2nd level of 11th season
Finish last level of 12th season
Finish 4th level of 13th season
Finish 6th level of 13th season
Play with the Droid
Finish level 6 of 6th season
Play with the boy
Finish the 17th level of the Adventure Mode
Play a random level
Create your first level
Create 5 levels
Play with the Dragon
Play with the Panda
Play with the cat
Mark 10 levels as favorite
Unlock a skin
Unlock a power
Finish the fourth season
Finish the sixth season
Finish the eighth season
Finish 10th season
Finish the 12th season
Pass the toilet paper to the scientist in need.
Perform surgical caffeine extraction from 20 machines.
Kill 10 Airborne Headcrabs using the Shotgun.
Kill 20 enemies with the Hivehand.
Use an entire clip of Gluon ammo in one continuous shot.
Help the Barnacle and Headcrab find true love.
Kill an Assassin with the .357 Magnum.
Kill 10 enemies with a reprogrammed Sentry.
Conduct all of the questionable research experiments.
Ruin the microwave casserole.
Get killed by your own Snarks.
Headshot 20 enemies with the .357 magnum.
Drown in Lambda Core's coolant.
Kill a Barnacle with a Satchel.
Kill a Headcrab using fire.
Kill a Marine with their own grenade.
Kill 10 enemies with Snarks.
Kill 5 enemies with one grenade.
Kill an Icthyosaur with either the Tau or Gluon.
Use the alternate path in Office Complex.
Interfere with the alarm and laptop in Anomalous Materials.
Get overtaken by a Headcrab's ample anterior.
Overcharge it anyway.
Send the Hidden Hat to Xen.
Refuse to insert the specimen into the Anti-Mass Spectrometer.
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