Black Mesa
Available on 1 platform.
Prolific PopperKill all Protozoans in the Borderworld.
44 FC2.0% of players
44 FC2.0% of players
43 FC2.1% of players
Post-Mortem IntervalFind each member of the missing research teams.
43 FC2.1% of players
43 FC2.4% of players
Laser ImmunizationComplete Interloper without taking any laser damage.
43 FC2.5% of players
43 FC2.6% of players
Rare SpecimenSend the Hidden Hat to Xen.
43 FC2.9% of players
Specimen GGTake out all three Healing Crystals in Nihilanth’s Chamber at the same time.
43 FC3.2% of players
Doctor’s SignatureDeliver the finishing blow to Gonarch with your Crowbar.
43 FC3.3% of players
Late for WorkDefeat Nihilanth in under 4 minutes.
43 FC3.4% of players
Black Mesa Decathlon WinnerEscape the Gargantua’s Lair without taking any damage from Gargantuas.
42 FC3.7% of players
Orbital TrajectorySkip the opening Xen island with a secret jump.
42 FC3.9% of players
42 FC4.0% of players
42 FC4.5% of players
Ethically QuestionableConduct all of the questionable research experiments.
41 FC5.3% of players
Our Brains And Your BrawnAssemble all the possible Scientists and Guards at the end of Office Complex.
41 FC5.3% of players
Gonad GliderGet whacked into oblivion in the ledge fight.
41 FC5.9% of players
Hyper Saturation ConundrumDrown in Lambda Core's coolant.
41 FC6.0% of players
Kinetic RepulsionKill a Marine with their own Grenade.
41 FC6.0% of players
One Step AheadKill 10 Enemies with Tripmines.
41 FC6.1% of players
Unified Coupling TheorumHelp the Barnacle and Headcrab find true love.
41 FC6.4% of players
Futile ResistanceKill 10 Enemies with Snarks.
40 FC7.1% of players
Digital WizardryKill 10 enemies with a reprogrammed Sentry.
39 FC8.8% of players
Resonance ProcrastinatorRefuse to insert the specimen into the Anti-Mass Spectrometer.
39 FC9.6% of players
Universal GravitationGet killed by your own Snarks.
38 FC11% of players
Stealth TechnologyEscape the Hangar in Surface Tension without alerting the Soldiers.
38 FC11% of players
38 FC11% of players
Remote DetonationKill a Barnacle with a Satchel.
38 FC11% of players
PhD in PacifismDon't kill any Vortigaunts in the Borderworld.
38 FC12% of players
Nuclear Fishin'Kill an Ichthyosaur with either the Tau or Gluon.
37 FC12% of players
Calculated TrajectoryKill 10 airborne Headcrabs using the Shotgun.
37 FC13% of players
Less Than Desirable ConsequencesDie in the AMS Beam before starting the experiment.
35 FC16% of players
Proverbial TinkererInterfere with the alarm and laptop in Anomalous Materials.
35 FC16% of players
Rather an AnticlimaxDecline G-Man’s offer of employment.
35 FC17% of players
Mega HertzKill 5 Enemies with one Grenade.
34 FC19% of players
Quantum CapacitanceOvercharge it anyway.
34 FC19% of players
Well-DoneCook a Grenade for too long.
33 FC19% of players
Caffeine ExtractionPerform surgical caffeine extraction from 20 vending machines.
32 FC21% of players
Centripetal AttractionKill 20 Enemies with the Hivehand.
31 FC23% of players
Dead ReckoningKill an Assassin with the .357 Magnum.
31 FC23% of players
Permeable InfrastructureUse the alternate path in Office Complex.
31 FC23% of players
Limitless PotentialAccept G-Man’s offer of employment.
30 FC25% of players
Inflammatory ActionsKill a Headcrab using fire.
30 FC26% of players
Premature ExpulsionUse an entire clip of Gluon ammo in one continuous shot.
29 FC27% of players
Anti-Matter Over MindKill a Controller without killing any of its mind-controlled Vortigaunt slaves.
29 FC28% of players
Prophylactic SuggestedGet overtaken by a Headcrab's ample anterior.
26 FC33% of players
Gray Matter PropulsionHeadshot 20 Enemies with the .357 Magnum.
24 FC37% of players
Convection RefinementRuin the microwave casserole.
18 FC50% of players
Brownian MotionPass the toilet paper to the Scientist in need.
14 FC61% of players