Fire

Fire Flasks are unlocked when you reach a sufficient amount of Golden Flasks, and once unlocked, start "burning" your fuel flasks that you got from researching the colored flasks across your Prestiges. This does not remove any fuel flasks. The main method of increasing fire flasks is to increase your fuel flasks by prestiging many times. Unlocking and using the Auto-Prestige feature is a must for gaining fuel flasks, as it lets you get them hands-off, and also doesn't reset as much as a manual prestige does.

## Producing Fire

Fire flasks slowly produce over time, with each cycle taking over a minute initially. This production time can be reduced by 10% (multiplicatively) by spending some of your earned fuel flasks. Keep in mind spending fuel flasks will reduce your Fire flask gains, so it is usually best not to increase the burn speed the moment you can purchase the upgrade. Waiting until you have between 5 - 10x the upgrade cost will allow you to keep roughly the same Fire flasks per unit time.

## Producing Fuel

Fuel Flasks are generated through research. Research is reset each time you prestige, therefore, the more you prestige and research new coloured flasks, the more Fuel Flasks you obtain.

Therefore, all skills boosting research (like Auto-Research) will, in turn, benefit Fuel Flask generation.

The fire skill: Auto-Prestige, resets research and crafting only. Once Auto-Prestige is unlocked, use Auto-Research and Presets to automate progress through each prestige.

Once Ice is unlocked, the fire skill: Prestige Cooldown enables prestiging every 5 seconds (as opposed to 60 seconds). With the right Presets, you can research all coloured flasks (red to black) earning all available Fuel Flasks from research within the 5 second prestige time. Therefore, obtaining all available fuel flasks every 5 seconds, on repeat.

## Upgrades

There are many different upgrades that can be purchased with Fire flasks, some have a limited number of times which you can purchase them, while others can be leveled forever.

### Unique purchase

The following upgrades may be purchased only once:

 Unlock crafting change all
 Unlock crafting presets
 Accelerators remain unlocked on prestige
 Unlock auto prestige that only resets research and crafting (online only)
 Gain more energy based on total Fire flasks earned (x^1.1) Kinda OP LOL
 Crafting slots don't reset on Freeze Mode/Ice Age
 Mastery doesn't reset on Freeze Mode/Ice Age
 Ice Age timer increments outside of Ice Age

### Limited purchase

These upgrades can be bought a specific number of times.

Auto Research (max 9)
 Auto research : Orange Flasks
 Auto research : Yellow Flasks
 Auto research : Green Flasks
 Auto research : Blue Flasks
 Auto research : Purple Flasks
 Auto research : Pink Flasks
 Auto research : White Flasks
 Auto research : Black Flasks

+1 Mastery slot (max 8)
 +1 Mastery slot
 +1 Mastery slot
 +1 Mastery slot
 +1 Mastery slot
 +1 Mastery slot
 +1 Mastery slot
 +1 Mastery slot

Gain Golden Flasks/s based on amount on prestige (max 10)
 2%
 3%
 4%
 5%
 6%
 7%
 8%
 9%
 10%

Increase exponent of Mastery effect (max 20)

### Unlimited purchase

These upgrade can be bought an unlimited number of times.

Increase how much Accelerator Generators get by 1% of energy/s
The initial cost is 5 and is increased of 50% every time an upgrade is bought.
1.5x  Golden Flask gains
The initial cost is 3,000 and is doubled with each purchase.
2.5x  Fire Flask gains
The initial cost is 2,500 and is multiplied by 6 with each purchase.
2x more Fire gains (Wow, again!)
The initial cost is 2.5e11 and is multiplied by 25 with each purchase.