Changes Based on Difficulty

Notes

• Bobs will attack player if "civilians killed by players" is 3 or more.
• Berserk monsters move at 1.5x speed.
• Oxygen normally drains at 1 unit per tick while in vacuum or underwater, meaning you have 360 seconds (6 minutes) of air
• One angular unit is about 0.7 degrees (1/512 of a circle)

Kindergarten

• Drop every fourth monster
• Demote every other major
• Alien damage (includes liquids) reduced by half
• Alien health reduced by half
• Alien movement reduced by one eighth
• Alien projectile speed reduced by one eighth
• Alien attack period tripled (frequency reduced to 1/3)
• Monster attack repetitions halved on each attack
• Guided projectiles change yaw and pitch at 10 and 8 angular units per tick
• Civilians killed by player count falls every 128 ticks (4.27 seconds)

Easy

• Drop every eighth monster
• Demote every fourth major
• Alien damage (includes liquids) reduced by one fourth
• Alien health reduced by one fourth
• Alien movement reduced by one sixteenth
• Alien projectile speed reduced by one sixteenth
• Alien attack period doubled (frequency reduced to 1/2)
• Monster attack repetitions halved on each attack
• Guided projectiles change yaw and pitch at 9 and 7 angular units per tick
• Civilians killed by player count falls every 256 ticks (8.53 seconds)

Normal

• Civilians killed by player count falls every 512 ticks (17.07 seconds)
• Monster attack repetitions reduced an extra time on each attack
• Guided projectiles change yaw and pitch at 8 and 6 angular units per tick

Major Damage

• Promote every other minor
• Alien health increased by one fourth
• Alien movement increased by one eighth
• Alien projectile speed increased by one eighth
• Alien attack period reduced by one half (frequency doubled)
• Guided projectiles change yaw and pitch at 7 and 5 angular units per tick
• Civilians killed by player count falls every 1024 ticks (34.13 seconds)
• Oxygen drains an extra point per tick while either trigger is held

Total Carnage

• No limit on ammo that can be picked up
• In Marathon 1, duplicate copies of a weapon can be picked up, replacing the one in the player's inventory
• Promote every minor
• Alien health increased by one half
• Alien movement increased by one quarter
• Alien projectile speed increased by one quarter
• Alien attack period reduced by 3/4 (frequency quadrupled)
• Guided projectiles change yaw and pitch at 6 and 4 angular units per tick
• Guided projectiles can lock onto invisible targets
• ticks_since_attack is not reset after monster attacks (the variable governing attack frequency)
• Civilians killed by player count falls every 2048 ticks (68.27 seconds)
• Oxygen drains an extra point per tick while either trigger is held
• Oxygen drains an extra point per tick while run is held in a vacuum, whether or not player is moving