Alien Swarm/Gameplay

Experience

After beating each mission, you will be awarded a certain amount of experience based on your performance during the level. By gaining experience, you will gain levels, which allows you to unlock new weapons and tools.

After completing the level, a summary screen is displayed which will show you how much experience was earned in specific categories.

• Objectives Complete (max 1000): The 1000 XP is divided evenly between the objectives in the level. Finishing all the objectives will net 1000 XP.
• Kills (max 100): Total number of enemies killed, irrespective of type.
• Completion Time (max 100): Faster times earn more XP.
• Friendly Fire Done (max 100): Each point of damage, inflicted by you or your sentries done to your team, will deduct one point.
• Damage Taken (max 100): Each point of damage taken during the mission will deduct one point, regardless of healing.
• Healing (max 50): As a Medic, every 10 health healed of a teammate will earn 1 XP, excluding Healing Kits.
• Fast Hacks (max 50): As a Tech, you will be awarded 25 XP per fast hack.

Achievements

Each achievement completed during a mission will award 50 XP. Although unlocked only the first time achieved, many can be completed again for the experience gain.

Difficulty

Based on the difficulty of the mission, the total XP earned will be increased or decreased by a certain percentage:

• Easy: -50%
• Normal: No change
• Hard: +20%
• Insane: +40%
• Brutal: +50%

Promotions

Once you reach level 27, you can choose to get promoted. Once promoted, you are returned to level 1 and all previously unlocked weapons are locked again. You will need to kill enemies to level up again, however the amount of experience required per level will be greater with each subsequent promotion.

An icon will be displayed beside your name once you reach each promotion level.

• First Promotion: Titanium Star
• Second Promotion: Carbide Star
• Third Promotion: Gallium Cross
• Fourth Promotion: Platinum Star
• Fifth Promotion: Osmium Star
• Sixth Promotion: Iridium Medallion

Experience to reach level

Level	Promotion							Unlocks
	0	1	2	3	4	5	6
1	N/A	N/A	N/A	N/A	N/A	N/A	N/A	N/A
2	1000	1000	1000	1000	2000	4000	6000	I3A Tactical Heavy Armor
3	1050	1050	1050	1050	2100	4200	6300	Model 35 Pump-action Shotgun
4	1100	1100	1100	1100	2200	4400	6600	X33 Damage Amplifier
5	1150	1150	1150	1150	2300	4600	6900	IAF Tesla Cannon
6	1200	1200	1200	1200	2400	4800	7200	Hornet Barrage
7	1250	1250	1250	1250	2500	5000	7500	Precision Rail Rifle
8	1300	1300	1300	1300	2600	5200	7800	Freeze Grenades
9	1350	1350	1300	1300	2700	5400	8100	IAF Medical Gun
10	1400	1400	1400	1400	2800	5600	8400	Adrenaline
11	1450	1450	1450	1450	2900	5800	8700	K80 Personal Defense Weapon
12	1500	1500	1500	1500	3000	6000	9000	IAF Tesla Sentry Coil
13	1550	1550	1550	1550	3100	6200	9300	M868 Flamer Unit
14	1600	1600	1600	1600	3200	6400	9600	v45 Electric Charged Armor
15	1650	1650	1650	1650	3300	6600	9900	IAF Freeze Sentry Gun
16	1700	1700	1700	1700	3400	6800	10200	M478 Proximity Incendiary Mines
17	1750	1750	1750	1750	3500	7000	10500	IAF Minigun
18	1800	1800	1800	1800	3600	7200	10800	Flashlight Attachment
19	1850	1850	1850	1850	3700	7400	11100	AVK-36 Marksman Rifle
20	1900	1900	1900	1900	3800	7600	11400	IAF Power Fist Attachment
21	1950	1950	1950	1950	3900	7800	11700	IAF Incendiary Sentry Gun
22	2000	2000	2000	2000	4000	8000	12000	Hand Grenades
23	2050	2050	2050	2050	4100	8200	12300	Chainsaw
24	2100	2100	2050	2050	4200	8400	12600	MNV34 Nightvision Goggles
25	2150	2150	2150	2150	4300	8600	12900	IAF High Velocity Sentry Cannon
26	2200	2200	2200	2200	4400	8800	13200	MTD6 Smart Bomb
27	2250	2250	2250	2250	4500	9000	13500	Grenade Launcher