Trinkets (also known as Shiny Trinkets) are shiny, coin-like collectibles that unlock music tracks in the Jukebox. There are 20 trinkets scattered about in-game, both within levels and the overworld. If Viridian collects all of the trinkets in the game and talks to Victoria, the Secret Lab is unlocked.
Question on Ask DSS Souleye blog
Locations / Rooms
Space Station 1
- It's a Secret to Nobody
- Trench Warfare
Space Station 2
- One Way Room
- You Just Keep Coming Back
- Clarion Call
- Doing Things the Hard Way (maybe the hardest, aka Veni Vidi Vici, DTTHW)
- Prize for the Reckless
The Warp Zone
- Edge Games (also one of the hardest)
The Laboratory
- Left of the Entanglement Generator, in the second unnamed room.
- Purest Unobtanium
- Young Man, It's Worth the Challenge
- The Tantalizing Trinket
The Final Level
- V (This trinket must be collected, if not, there is no way to progress, there is no way to re-access the Polar Dimension later.)
2 trinkets are located in The Tower, 4 are in the overworld, and either Vitellary or Victoria hands one to the player.
Trivia
Prize for the Reckless uses a special mechanic, which requires you to die. Because of it, in No Death Mode and Time Trials, the room is a lot easier and is renamed, "Imagine Spikes there, if You Like" in Time Trials, and, "I Can't Believe You Got This Far" in No Death Mode.
Veni Vidi Vici (Doing Things the Hard Way), I'm Sorry (Can You Forgive Me?) and Edge Games are the hardest trinkets in-game.
Doing to how VVVVVV is programmed, you can only place 20 trinkets in a custom map.
Upon getting all the trinkets, they explode and create a giant teleporter that brings the crew to the Secret Lab.
Estimate difficulty:
It's a Secret to Nobody (Very Easy)
Trench Warfare (Easy)
One Way Room (Very Easy)
You Just Keep Coming Back (Medium)
Clarion Call (Easy)
Doing Things the Hard Way (Nearly Impossible)
Prize for the Reckless (Hard on Normal mode) (Very Easy in any other)
Edge Games (Hardest)
Young Man, It's Worth the Challenge (Easy)
Unnamed #1 (Lab) (Easy)
The Tantalizing Trinket (Easy)
Purest Unobtainium (Medium)
V (Obtained in Campaign)
Crewmate (After getting 10 trinkets) (Very Easy)
The Tower #1 (Medium)
The Tower #2 (Medium)
Unnamed #2 (Near the Elephant) (Very Easy)
Unnamed #3 (Near Warp Zone) (Very Easy
Unnamed #4 (Medium)
Unnamed #5 (Easy or Medium)