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 level

Level	Promotion
	0	1	2	3	4	5	6
1		1000	1000
2		1050	1050			4200
3		1100	1100			4400
4		1150	1150			4600
5		1200	1200			4800
6		1250	1250			5000
7		1300	1300		2600	5200
8		1350	1300		2700	5400
9		1400	1400			5600	8400
10	1450	1450	1450			5800	8700
11	1500	1500	1500			6000	9000
12	1550	1550				6200	9300
13	1600	1600				6400	9600
14	1650	1650				6600	9900
15	1700	1700				6800	10200
16	1750	1750				7000	10500
17	1800	1800				7200	10800
18	1850	1850				7400	11100
19	1900	1900				7600	11400
20	1950	1950				7800	11700
21	2000	2000				8000	12000
22	2050	2050				8200	12300
23	2100					8400	12600
24						8600	12900
25						8800	13200
26						9000	13500