Invasion... Level 1: Contamination

Invasion... Level 1: Contamination
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Authors	Andy Chen, Claude Martins
Port	Vanilla Doom
IWAD	Doom
Year	1994
Link	Doomworld/idgames

This level occupies the map slot E1M1. For other maps which occupy this slot, see Category:E1M1.

This article about a map is a stub. Please help the Doom Wiki by adding to it.

Invasion... Level 1: Contamination is a single-level PWAD for Doom that was released in 1994. It was designed by Andy Chen and Claude Martins. It was followed by Invasion... Level 2: The Upper Decks.

Walkthrough

Map of Invasion... Level 1: Contamination

Letters in italics refer to marked spots on the map. Sector, thing, and linedef numbers in boldface are secrets which count toward the end-of-level tally.

Secrets

1. Go through the first door and turn right. Near the first armor bonus you reach are two alcoves. Pressing the western one opens up a secret door opposite leading to a passage with a shotgun guy and two health bonuses (on medium and hard skills only), and a megaarmor which lies on a teleporter to the south-east area. Both the passage to the teleporter and the teleporter itself count as secrets. (sector 27)
2. See #1. It is not possible to receive credit for this secret as the player teleports before stepping on the sector. (sector 28)
3. From the blue key, head east then south. Continue through a fake wall, at the end of which is a soul sphere. (sector 118)
4. Heading north from the blue key area, there are two passages to the west. Between them is a fake wall, through which is a partial invisibility and a lift leading up to a berserk. (sector 122)
5. The room with the teleporters leading to the red key area has a secret door on its north wall leading via a second door and a lift to the yellow key and a box of shells. Both the sector between the doors and the yellow key sector count as secrets. (sector 256)
6. See #5. (sector 179)
7. Head north from the blue key area then turn right at the end and right at the end of that path. Immediately on the left is a fake wall through which is a shotgun guy on a platform (on medium and hard skills) and a nukage pit down below, which contains a chainsaw as well as (on medium and hard skills) a medikit and a spectre (two on hard skill). There is a switch which causes the platform to lower, allowing you to jump across and out of this area. Note that entering this area activates a crushing ceiling. (sector 285)

Bugs

Because one secret cannot be achieved (see Secrets section), the maximum secrets percentage obtainable is 85%.

If the player goes through the teleporter in Secret #2, he will be stuck in the south-east area unless he both has the red key and has pressed the switch near the computer map.

Demo files

This WAD features three built-in demos by the authors. All require Doom v1.2 to view them. The demos are:

Demo	Skill	Tics	Length
DEMO1	3	3528	1:40.80
DEMO2	3	9820	4:40.57
DEMO3	3	16875	8:02.14

Speedrunning

Current records

The records for the map at the Doom Speed Demo Archive are:

Run	Time	Player	Date	File	Notes
UV speed	3:56.43	Serge Marudov (Never_Again)	2014-03-26	inv1-356.zip
NM speed
UV max	14:49.03	Serge Marudov (Never_Again)	2014-03-26	inv1-1449.zip
NM 100S
UV -fast
UV -respawn
UV Tyson
UV pacifist

The data was last verified in its entirety on November 30, 2021.

Deathmatch

Player spawns

This level contains thirteen spawn points:

1. facing south. (thing 227)
2. facing north. (thing 228)
3. facing south. (thing 229)
4. facing south. (thing 230)
5. facing south. (thing 231)
6. facing north-west. (thing 232)
7. facing south-east. (thing 233)
8. facing west. (thing 234)
9. facing west. (thing 235)
10. facing south. (thing 236)
11. facing north. (thing 237)
12. facing south-east. (thing 555)
13. facing north-west. (thing 568)

Statistics

Map data

Things	671
Vertices	1519*
Linedefs	1720
Sidedefs	2417
Sectors	389

* The vertex count without the effect of node building is 1347.

Things

This level contains the following numbers of things per skill level:

Single-player
Monsters	1-2	3	4-5
Zombieman	0	9	21
Shotgun guy	14	46	87
Imp	51	96	136
Demon	11	32	47
Spectre	0	8	22
Cacodemon	1	2	6
Baron of Hell	2	3	4
Weapons	1-2	3	4-5
Chainsaw	1
Shotgun	1
Chaingun	1
Rocket launcher	1
Ammunition	1-2	3	4-5
Box of bullets	21	21	22
Box of shotgun shells	42	59	60
Health & Armor	1-2	3	4-5
Stimpack	10	12	12
Medikit	22	31	31
Armor	2	1	0
Megaarmor	1	2	3
Items	1-2	3	4-5
Armor bonus	10	13	13
Health bonus	13	22	22
Supercharge	2
Backpack	2
Berserk	1
Computer area map	1
Light amplification visor	1	1	0
Partial invisibility	2
Radiation shielding suit	1
Keys	1-2	3	4-5
Blue keycard	1
Red keycard	1
Yellow keycard	1
Miscellaneous	1-2	3	4-5
Exploding barrel	16
Teleport landing	15

Multiplayer
Monsters	1-2	3	4-5
Zombieman	0	9	21
Shotgun guy	14	46	87
Imp	51	96	136
Demon	12	36	55
Spectre	0	8	24
Cacodemon	1	2	6
Baron of Hell	2	3	4
Weapons	1-2	3	4-5
Chainsaw	1
Shotgun	1
Chaingun	1
Rocket launcher	1
Ammunition	1-2	3	4-5
Box of bullets	21	21	22
Box of shotgun shells	45	62	63
Health & Armor	1-2	3	4-5
Stimpack	10	12	12
Medikit	22	31	31
Armor	2	1	0
Megaarmor	1	3	4
Items	1-2	3	4-5
Armor bonus	10	13	13
Health bonus	13	22	22
Supercharge	2
Backpack	2
Berserk	1
Computer area map	1
Light amplification visor	1	1	0
Partial invisibility	2
Radiation shielding suit	1
Keys	1-2	3	4-5
Blue keycard	1
Red keycard	1
Yellow keycard	1
Miscellaneous	1-2	3	4-5
Cooperative start	4
Deathmatch start	13
Exploding barrel	16
Teleport landing	15

External links

• Invasion... Level 1: Contamination at Doomworld/idgames
• Invasion... Level 1: Contamination at the Doom Speed Demo Archive
• Review at ONEMANDOOM: WAD Reviews