Depth Incremental Upgrades

If you are deciding which Depth Incremental upgrades to buy, target the delay that is slowing your next run. Use Digging Speed when descending takes too long, Cash Boost when income cannot fund the next purchase, and Walk Speed when underground travel is the largest part of the loop. This bottleneck rule is more reliable than a fixed tier list because upgrade prices and your current route change over time. If the next purchase is a new depth, check the area gate requirements before spending your reserve.

Upgrade priorities at a glance

The table describes roles, not a permanent ranking. The available evidence confirms the broad effects and decision context, but it does not provide a current in-game spreadsheet of every upgrade level. Treat the live panel as decisive for the price and result of the purchase.

Best early upgrade order

Use this route when you are still establishing a repeatable digging loop:

1. Fix slow digging first. If most of the run is spent waiting for downward progress, buy Digging Speed before a comfort upgrade. Faster descent gets you to deeper areas and resource points sooner.
2. Add Cash Boost when prices become the wall. If you can reach your current target but cannot afford the next upgrade or Area, increase income instead of repeatedly buying movement upgrades that do not solve the shortage.
3. Buy Walk Speed when the route is long. Walk Speed becomes more valuable after you are repeatedly moving between digging locations, resource points, and area entrances. It is less urgent when digging itself still dominates the timer.
4. Recheck the bottleneck after each purchase. Do not assume the same priority remains correct. A Digging Speed purchase can expose an income bottleneck; a Cash Boost can make a deeper route worth taking.

This route turns each purchase into a testable improvement: compare how long the next run spends digging, walking, and waiting for Cash. The goal is not to maximize one displayed stat; it is to shorten the full loop to the next meaningful milestone.

Compare movement and resource upgrade priorities

These moments support the upgrade-order guidance by showing the Walk Speed and Digging Speed progression, then a later Worm and Fossil upgrade discussion with a possible Golden Worm target.

Load 6:49 · Max Walk Speed, then raise Digging SpeedLoad 24:31 · Review the Worm, Fossil, and Golden Worm upgrade discussion

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Mid-game resource upgrades

Once you can reach deeper Areas consistently, shift some spending toward the resource that funds the next jump.

Cash Boost for expensive progression

Cash Boost is the most useful response when your income rate is behind the cost curve. Keep farming the deepest Area you can clear consistently, then compare the time needed for the next meaningful upgrade with the time needed before the boost. If your best purchase is far out of reach, Cash Boost has a clearer immediate job than another Walk Speed level.

Do not treat Cash Boost as an automatic first buy in every run. When digging is still painfully slow, the extra income may not compensate for the time lost reaching the reward. Resolve the largest delay first, then return to Cash Boost as costs rise.

Fossil upgrades for a Fossil goal

Fossil upgrades are situational. They make more sense when Fossils are the resource you are actively collecting or using for a progression target, rather than when your only problem is reaching the next depth. Combine Fossil output improvements with an efficient digging route so the upgrade affects more than a small number of runs.

The reviewed sources mention more Fossils and higher Fossil gains, but they do not establish a complete official level list. Avoid publishing or relying on an exact Fossil multiplier unless the current in-game panel confirms it.

Worm-related upgrades and Golden Worms

Worm-related upgrades can support Worm collection and related rewards. Save enough Worms for the next known milestone before spending on an optional improvement. One recorded discussion mentions a high target of about 800 Worms and a possible Golden Worm chance, but the subtitle has recognition errors and does not prove a universal price, drop rate, or named upgrade.

That makes Worm spending a live-panel decision: confirm the displayed requirement, the actual effect, and whether the purchase advances your next Area or resource goal. Do not convert the recorded 800 Worms reference into a full upgrade table.

When to prepare for a Boss or Area gate

Switch from farming speed to strength when a Boss or another deep-area obstacle is the reason progress stops. More Cash per run does not help if you cannot pass the gate that unlocks the next Area. Invest in the strength-related option that the live game presents, then use an attempt as a progress check rather than repeatedly retrying unchanged.

Use this check before committing resources:

• Can you reach the gate consistently?
• Is the failure caused by combat or by an unmet Cash/Worm requirement?
• Which displayed attribute does the encounter actually ask you to improve?
• Will the purchase change the blocked encounter, or only make farming faster?

The supplied summary mentions Character Strength as a situational deep-progression upgrade, but it does not confirm that it is a separate named menu item or provide its exact requirements. Keep that distinction in mind when reading advice from older pages or videos.

Avoid spreading upgrades too thin

Buying one level in every available track can feel balanced, but it often leaves the real bottleneck untouched. Concentrate on one problem until the next run improves, then redirect when the limiting factor changes. A practical loop is:

1. Run the deepest route you can complete reliably.
2. Identify whether digging, walking, income, a resource requirement, or a gate caused the delay.
3. Buy the matching upgrade if its live effect addresses that delay.
4. Repeat the route and compare the next purchase time.

This also helps with rising costs. The evidence records that upgrade prices increase as levels rise, so a track that was efficient at one level may stop being the best use of resources later.

FAQ

What is the best overall Depth Incremental upgrade?

There is no supported universal winner. Digging Speed is the strongest general response to slow descent, Cash Boost is strongest against an income wall, and Walk Speed is strongest when travel dominates the route. Choose based on the time you are actually losing.

Should I max Walk Speed before Digging Speed?

Not automatically. A recorded video discusses maxing Walk Speed and then raising Digging Speed, but that is a playthrough decision rather than a confirmed rule for every account. If digging is slower than travel in your run, reverse that priority.

Does upgrading make Area unlocks cheaper?

The evidence supports upgrades helping you earn resources and progress toward Areas, but it does not establish that an upgrade directly reduces an Area's displayed requirement. Check the live Area panel for the exact Cash or Worm requirement.

Should I reset or rebirth before buying another upgrade?

The supplied material identifies Rebirth as a longer-term planning factor but does not provide complete reset values. Check the live Rebirth panel and compare the permanent benefit with the progress you would abandon before committing. Do not infer a specific reset route from this upgrade guide.