Upgrade the problem you can see

Base upgrades matter most when they answer a wave, not when they simply make the menu look complete.

Last checked August 18, 2026 · Official game linked

Decision path

Spend after the first signal.

Run enough of the opening loop to see what is slowing your defense.
Open the Base upgrade area and read the current requirement.
Choose one upgrade that supports the plant setup you are actually using.
Play another wave before buying a second upgrade.

A simple test

Can you name the benefit?

If you cannot describe what the upgrade changes on the field, wait. You can always return to the menu after you have more information.

Use the full first-session route

Current boundary

No fixed cost table yet.

Public pages and videos do not agree enough for a trustworthy numeric table. This page stays useful by giving you the decision order and pointing you to the current in-game value.

Read the live menu

When should I buy a base upgrade?

After the first waves show you a real pressure point. Choose an upgrade whose effect you can see and explain in the current menu.

Where are the exact upgrade costs?

Exact costs were not stable across the available evidence. Read the current Base upgrade panel before spending and treat older tables as a lead, not a promise.