Skip to content
The Sunken City — Onirism Walkthrough
Onirism

The Sunken City — Onirism Walkthrough

Complete walkthrough for Onirism's The Sunken City, guiding you to every treasure chest, upgrade, secret, and boss fight. Detailed steps and timings included.

By ···10 min read·Multi-source verified
1 reading this guide  

Complete walkthrough for Onirism's The Sunken City, guiding you to every treasure chest, upgrade, secret, and boss fight. Detailed steps and timings included.

Walkthrough
  1. 1
    0:00-0:28 Treasure Chest 1: Flaregun
  2. 2
    0:29-1:36 Upgrade 1: Battery Ammo
  3. 3
    1:37-3:37 Treasure Chest 2: 150 Pearls
  4. 4
    3:38-3:56 Treasure Chest 3: Pico Pico Axe
  5. 5
    3:57-5:03 Treasure Chest 4: 150 Pearls
  6. 6
    5:04-5:34 Dreamstone 1
  7. 7
    5:35-6:37 Treasure Chest 5: 150 Pearls
  8. 8
    6:38-6:55 Treasure Chest 6: 150 Pearls
  9. 9
    6:56-8:54 Treasure Chest 7: 150 Pearls
  10. 10
    8:55-9:45 Treasure Chest 8: Big Boomstick
  11. 11
    9:46-12:24 Treasure Chest 9: Bazooka
  12. 12
    12:25-12:56 Upgrade 2: Umbrella Charge
  13. 13
    12:57-15:56 Upgrade 3: Firework Ammo
  14. 14
    15:57-16:52 Emily's Brewery
  15. 15
    16:53-17:52 Treasure Chest 10: 150 Pearls
  16. 16
    17:53-19:15 Treasure Chest 11: 150 Pearls
  17. 17
    19:16-19:49 Emily & Upgrade 4: Super Grip
  18. 18
    19:50-21:44 Treasure Chest 12: 150 Pearls
  19. 19
    21:45-22:21 Key
  20. 20
    22:22-24:01 Treasure Chest 13: Frag Fruit
  21. 21
    24:02-25:01 Treasure Chest 14: 150 Pearls
  22. 22
    25:02-25:27 Treasure Chest 15: Dual Splashers
  23. 23
    25:28-26:03 Upgrade 5: Soapy Water Ammo
  24. 24
    26:04-28:08 Treasure Chest 16: Perfume Bomb
  25. 25
    28:09-28:38 Treasure Chest 17 & 18: 150 Pearls and Scissors
  26. 26
    28:39-29:08 Treasure Chest 19: 100 Pearls
  27. 27
    29:09-29:51 Treasure Chest 20: Fairy Wand
  28. 28
    31:12-32:10 Upgrade 6: Extra Health
  29. 29
    32:11-32:59 Treasure Chest 21: P-Lah Mk3
  30. 30
    33:00-33:58 Upgrade 7: Foam Ammo
  31. 31
    33:59-35:13 Upgrade 8: Stamina Expansion
  32. 32
    35:14-35:30 Treasure Chest 22: 150 Pearls
  33. 33
    35:31-35:45 Upgrade 9: Energy Ammo
  34. 34
    35:46-36:15 Treasure Chest 23: 150 Pearls
  35. 35
    36:16-39:49 Inferno Valley
Tips
  • The guide covers multiple areas including Chroma Falls, Inferno Valley, Windy Meadows, Shining Treetops, Tortibobble Swamps, Oasis Greenhouse, Pinewood Summit, The Glacier, and Borealis Sea.
  • Pay attention to the timestamps for each item and upgrade.
  • Some sections involve specific puzzles or battles, like the Tube Puzzle in The Glacier or the Jarl Fight in Borealis Sea.
  • Numerous treasure chests containing Pearls, weapons (Flaregun, Pico Pico Axe, Big Boomstick, Bazooka, etc.), and unique items (Frag Fruit, Scissors, Fairy Wand, etc.).
  • Various upgrades to enhance gameplay (Battery Ammo, Umbrella Charge, Super Grip, Extra Health, Foam Ammo, Stamina Expansion, etc.).
  • Dreamstones are scattered throughout the areas.

100% Human-Written. AI Fact-Checked. Community Verified. Learn how AntMag verifies content