Build a base RNG Index Rewards Guide

Complete Index rewards guide for Build a base RNG: claim bonuses, permanent luck multipliers, coin payouts, and Wave 20 crafting unlocks.

What the Index Tracks

The Index is a collection log of every structure, weapon, block, and mutation you Roll in Build a base RNG. Each unique entry can be leveled and claimed for rewards. Unlike one-time drops, Index bonuses are permanent account power — coin payouts plus luck multipliers that stack with the skill tree.

Keep Auto Roll running so Index entries unlock continuously. More entries → more claims → higher luck → better Rolls. This feedback loop is the hidden engine behind fast accounts.

How to Claim Index Rewards

  1. Open the Index menu from the main HUD (book or collection icon).
  2. Find items with a claimable badge — new Rolls or level-ups light up first.
  3. Tap each entry to collect coin bundles and luck multiplier increases.
  4. Level items by Rolling duplicates — e.g. Wood Block Level 1 pays ~90 coins plus a luck bump.
  5. Repeat after every session before spending coins on gambling Rolls.

Claiming takes 30 seconds and often funds your next skill tree node. Never skip this step on login.

Which Index Entries Matter Most

Early game: claim everything — Commons still pay coins and luck. Mid game: prioritize entries that level quickly with Auto Roll (basic blocks, common turrets). Late game: track missing Legendary entries for completionist luck stacks.

Pair Index grinding with luck guide math. A 0.5% luck increase from Index feels small but compounds across thousands of Auto Rolls.

Wave Milestones & Crafting

Wave 20 is a major Index-adjacent milestone. A giant boss zombie spawns and can overwhelm unprepared bases. Clearing Wave 20 unlocks a new crafting recipe flagged on screen for the Crafting Machine (~150,000 coins to unlock the station).

Bosses begin appearing around Wave 15 with custom attacks and Relic drops. Index luck and skill tree upgrades make those waves survivable — read boss guide and relic drops.

Index Login Routine

Every login: collect offline earnings → claim all Index rewards → repair defenses → then Roll or push waves. This order maximizes coin efficiency and keeps luck climbing before you gamble on rarity.

Track progress alongside become rich guide snowball steps.

Frequently Asked Questions

Do Index rewards reset?
No — claimed luck and coin bonuses are permanent on your account.
How much luck does Index give?
Varies per item level — Wood Block L1 is ~90 coins plus a luck multiplier. Total Index luck becomes significant over time.
Does Auto Roll fill the Index?
Yes — Auto Roll is the best way to unlock entries passively while building.
What unlocks at Wave 20?
A boss encounter plus a new crafting recipe for the Crafting Machine system.