All Secrets & Challenges Video Guide (In Progress)

All Secrets and Challenges Video Guide

Prelude - The Mouth of Hell

Ultrakill - Episode 1 - Prelude
Overture - The Mouth of Hell
0-1: Into the Fire (00:00)
Secrets: 00:27 - 01:10 - 01:28 - 02:30 - 02:43
Challenge: 00:58
Boss Fight: 03:04

0-2: The Meatgrinder (03:50)
Secrets: 04:02 - 04:37 - 05:22 - 07:43 - 08:17
Challenge: 05:31
Secret Level Entrance: 08:54
Boss Fight: 05:31

0-S: Secret Mission - Something Wicked (09:30)

0-3: Double Down (10:51)
Secrets: 14:15 - 15:31 - 16:48
Challenge: 10:55
Boss Fight: 11:41 - 17:00

0-4: A One-Machine Army (18:04)
Secrets: 19:04 - 19:35 - 21:05
Challenge: 21:40

0-5: Cerberus (22:14)
Challenge and Boss Fight: 22:35

Act I - Layer 1 - Limbo

1-1: Heart of the Sunrise (00:00)
Secrets: 00:25 - 00:33 - 01:15 - 03:04 - 04:25
Secret Switch I: 05:01
Challenge: 05:27
Secret Level Entrance: 05:27

1-S: Secret Mission - The Witless (05:44)

1-2: The Burning World (10:43)
Secrets: 12:16 - 12:25 - 14:00 - 14:23 - 14:55
Secret Switch II: 15:03
Boss Fight: 15:32
Challenge: 17:38

1-3: Halls of Sacred Remains(20:11)
Secrets: 21:15 - 21:37 - 23:17 - 25:00 - 28:21
Challenge: 28:30
Secret Switch III: 28:30
Boss Fight: 28:30 - 30:19

1-4: Clair de Lune (32:06)
Secret Switch IV and Secret Revolver: 33:35
Challenge: 35:41
Boss Fight: 34:33

Act I - Layer 2 - Lust

2-1: Bridgeburner (00:00)
Secrets: 00:05 - 01:24 - 02:34 - 03:12 - 04:50
Challenge: 05:08

2-2: Death At 20,000 Volts (06:09)
Secrets: 06:56 - 08:45 - 08:56 - 09:37 - 09:50
Challenge: 11:31

2-3: Sheer Heart Attack (12:38)
Secrets: 13:02 - 13:13 - 14:03 - 14:40 - 15:33
Secret Water Control: 13:02 - 14:03 - 14:40
Secret Level Entrance: 15:49
Challenge: 14:25

2-4: Court of the Corpse King (17:56)
Challenge: 20:15
Boss Fight: 18:51 - 20:08

Act I - Layer 3 - Gluttony

3-1: Belly of the Beast (00:00)
Secrets: 01:10 - 02:30 - 03:27 - 05:40 - 07:11
Challenge: 00:50
Secret Level Entrance: 03:27 (Not yet available)

3-2: In The Flesh (07:38)
Challenge: 09:08

[Matte]

The vids could be a bit better timestamped but it's an excellent guide otherwise. Also if you remake them maybe cut the combat so skimming through to find the relevant steps is easier.