In the Roblox game Tower Incremental (developed by Lucky CStudios), crystals serve as a critical mid-to-late-game currency unlocked after clearing the early iron mining and smelting stages. Players use crystals to fund Upgrade Tree 2, lock in permanent upgrade boards before rebirthing, purchase stat-boosting trails and potions, spin the prize wheel, and power the late-game Prism Refractor machine.
Because crystals reset upon basic rebirths unless protected by specific milestones, knowing where to spend them efficiently prevents wasted grinding in the Crystal Mine.
All Verified Crystal Uses in Tower Incremental
Crystals are required across several distinct stations, vendors, and structural upgrades throughout the tower floors.
| Station / Feature | Crystal Cost / Requirement | Primary Benefit |
|---|---|---|
| Upgrade Tree 2 | Starts at 200,000 crystals | Unlocks crystal multipliers (such as 2x crystals), bulk smelting nodes, and global gold multipliers. |
| Permanent Upgrades | Varies by tier (hundreds of thousands to millions) | Preserves upgrade boards, tree sections, and lower-tier glyphs through future rebirths. |
| Trail Merchant | 15,000 to 200,000+ crystals (e.g., Mythic Storm, Celestial) | Grants passive multipliers to gold, silver, iron, and player luck. |
| Prize Wheel | 100,000 crystals per spin | Grants temporary boosts (such as 2x gold for 10 minutes) or chances at rare and exotic trails. |
| Potion Merchant | Approximately 150,000 crystals per batch | Provides timed multiplier potions that stack with current floor stats. |
| Prism Refractor | Bulk crystal deposits (millions to billions) | Converts crystals into Prisms, an essential currency required for late-stage tower rebirths. |
| Crystal Mine Upgrades | Incremental scaling; 100,000 crystals for range | Boosts crystal harvest yield, speeds up regrowth intervals, boosts gold via crystal power, and increases harvesting radius. |
Detailed Breakdown of Crystal Spending
1. Upgrade Tree Progression
Once players reach the mid-tower floors, Upgrade Tree 2 opens up and switches from requiring iron to requiring crystals. The opening node typically costs 200,000 crystals. Investing crystals into this tree is crucial because it provides stacking 2x Crystal multipliers, bulk conversion upgrades, and gold scaling. Multiple player runs confirm that buying tree multipliers increases crystal income far more effectively than manually grinding low-level harvest stats inside the mine.
2. Permanent Upgrades Across Rebirths
Higher-tier permanent upgrade stations require raw crystals alongside gold and iron. These permanent upgrades allow you to retain:
- Specific sections of the Upgrade Tree.
- Certain upgrade boards located in mining rooms.
- Specific glyph rooms (such as water or poison glyphs) so their multipliers do not wipe when you execute a rebirth.
Because rebirthing resets unprotected crystal balances, buying every available permanent upgrade on your current floor before activating a rebirth is standard practice.
3. Trail Merchant
A dedicated trail merchant found above the crystal mining floors sells advanced cosmetics with gameplay multipliers for crystal currency. Examples recorded during tower climbs include:
- Mythic Storm Trail: Costs 15,000 crystals.
- Celestial Trail: Requires high-tier crystal reserves.
Equipping these trails provides direct multipliers to resource gain and luck, which speeds up glyph rolling.
4. Prize Wheel Spins
Located on floor 46, the Prize Wheel charges 100,000 crystals per spin. Documented rewards include:
- Timed production buffs (such as 2x gold for 10 minutes).
- Rare trails (approximate 6% pull rate).
- Exotic trails (approximate 2% pull rate).
While the wheel provides useful bonuses, players generally consider it a secondary sink after secure progression upgrades are completed.
5. Potion Merchant Batches
A crystal-tier merchant offers bulk potion purchases priced around 150,000 crystals. These potions provide timed stat multipliers that help bridge the gap when climbing toward high-cost staircases and rebirth thresholds.
6. The Prism Refractor (Late-Game Conversion)
On the upper floors leading toward the top of the tower, players encounter the Prism Refractor. This machine functions similarly to the earlier iron smelter and Star Forge:
- Players deposit crystals directly into the refractor.
- The machine processes crystals over several seconds (with upgradable cycle times and yield multipliers) to output Prisms.
- Prisms are mandatory to satisfy late rebirth milestones (such as the 25,000 Prism and 1,000,000 Prism requirements) and unlock the gateway to subsequent towers.
7. Crystal Mine In-Room Enhancements
Inside the Crystal Mine room, players can spend crystals directly on the local board to improve farming efficiency:
- Harvest Yield: Increases the base amount of crystals gathered per node.
- Regrowth Speed: Decreases the wait time for crystal formations to respawn.
- Crystal Power: Adds an extra multiplier to gold earnings based on your crystal activity.
- Mining Proximity / Range: Costs 100,000 crystals to significantly expand harvesting reach, allowing players to clear the entire room from a stationary position.
Best Crystal Spending Priority
Based on recorded playthrough strategies, spending crystals in the following order prevents bottlenecks:
- Local Mining Range & Regrowth: Upgrade the Crystal Mine yield and range to reach semi-automated harvesting so you no longer need to walk node-to-node.
- Upgrade Tree 2 Multipliers: Save up the initial 200,000 crystals to unlock Upgrade Tree 2 and grab the stacking 2x crystal nodes.
- Permanent Upgrades: Before executing any rebirth, purchase all permanent upgrade slots that cost crystals to preserve tree sections and boards.
- Prism Refractor Feeds: In the late game, channel excess crystals directly into the Prism Refractor to meet rebirth prerequisites.
- Prize Wheel and Trails: Treat the 100,000 crystal wheel spins and cosmetic merchants as optional sinks once core multipliers and permanent saves are secure.
How to Increase Crystal Gain
To afford high-tier crystal upgrades, players combine several mechanics:
- Glyph Multipliers: Rolling glyphs in rooms such as Electric, Earth, and Radiant glyph zones grants passive multipliers directly to crystal yield.
- Tree Multipliers: Stacking the 2x crystal upgrades from the upgrade tree compounds multiplicatively.
- Game Passes: The official 2x Crystals game pass doubles all collected crystals, stacking alongside free-to-play multipliers.
Frequently Asked Questions
Do crystals carry over when you rebirth in Tower Incremental?
No. Raw crystal currency resets upon rebirth unless you spend them beforehand or unlock specific permanent upgrades that protect designated floor features. Spend your crystals on permanent upgrades, trees, or trails before confirming a rebirth.
Where is the Crystal Mine located?
The Crystal Mine is unlocked on the staircase after clearing the early silver and iron tiers, appearing around floor 30 before the second major rebirth checkpoint.
Is the 100,000 crystal range upgrade worth it?
Yes. Purchasing the distant mining upgrade for 100,000 crystals allows your character to harvest crystals across the chamber without manually walking to each deposit, enabling AFK farming in the mine room.
