Tunneling Codex in Mina the Hollower
Quick Answer: What Does Tunneling Codex Do?
Tunneling Codex is a utility Trinket in Mina the Hollower that lets Mina hold Jump to burrow repeatedly without needing to land between burrows. It is especially useful for movement-heavy rooms, pit traversal, exploration, and repeated cleanup routes.
To get Tunneling Codex, enter the Ring Dive Parlor in Bone Junction, west of Sandfalls, pay the Ring Master 100 Bones, and score 5,000 points in the Ring Diver minigame.
Trinket Details
- Effect: Hold Jump to burrow repeatedly without needing to land.
- Location: Bone Junction, west of Sandfalls.
- Reward Source: Ring Master at the Ring Dive Parlor.
- How to Get: Pay 100 Bones to enter the Ring Diver minigame and score 5,000 points.
- Category: Movement and exploration utility.
- Slot Cost: 1 Trinket slot.
Is Tunneling Codex Worth Using?
Tunneling Codex is worth using when a route depends on repeated burrowing, precise movement, or crossing hazardous gaps. Removing the need to land before burrowing again makes traversal feel faster and more forgiving.
It is particularly useful during exploration and 100% cleanup, when Mina needs to revisit movement-heavy rooms multiple times. It can also be paired with movement-focused Trinkets such as Wallower's Gauntlets for unusual pit and hover strategies.
Its main weakness is opportunity cost. Tunneling Codex uses a Trinket slot without directly increasing damage or defense, so boss-focused builds may prefer a combat Trinket instead.
Best Uses for Tunneling Codex
- Repeated burrow movement without needing to land.
- Water or traversal-heavy sections where movement control matters.
- Cleanup routes where revisiting rooms quickly is important.
- Players who prefer movement utility over raw damage.
- Pairing with checklist-style completion runs.
Tunneling Codex and 100% Cleanup
Tunneling Codex is useful during 100% cleanup because it makes movement and repeated traversal less annoying. If you are checking missing Trinkets, revisiting old rooms, or cleaning up hidden routes, this Trinket can save time.
If Tunneling Codex is missing from your collection, check the Ring Dive Parlor in Sandfalls and compare your save against the All Trinket Locations checklist.
Tunneling Codex FAQ
Where Do You Find Tunneling Codex?
Tunneling Codex is awarded at the Ring Dive Parlor in Bone Junction, west of Sandfalls. Reach the parlor through the hole past the lowered rope and speak with the Ring Master.
How Do You Unlock Tunneling Codex?
Pay the Ring Master 100 Bones to enter the Ring Diver minigame, then score at least 5,000 points. Burrow into rings or emerge from the ground inside them, build combos, and use golden rings to improve the score.
Is Tunneling Codex Worth Using?
Yes, especially for exploration, movement-heavy rooms, pit traversal, and 100% cleanup. It is less valuable in pure damage builds because it improves mobility rather than attack power or defense.