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The Forge is unlocked when you reach the Underground City, on Km.303. Here you can forge Gems to improve your Weapons.

You can use the shortcut "G" (Gem Forge) to reach it. This is very useful when using timelapses repeatedly and forging short-timed gems.

Gem cost[]

Gem and Catalyst
Item Time Slots Material 1 Material 2 Material 3 Oil Cost
Red GemForgedRedGem 10 Min 1 x2,000 Red Diamond
Blue GemForgedBlueGem 30 Min 2 10k Blue Obsidian x1 Oil $10 Billion
Green GemForgedGreenGem 4 Hour 3 10k Coltan 10k Californium x4 Oil $30 Billion
Purple GemForgedPurpleGem 16 Hour 4 25 Red Gem 25 Blue Gem x25 Polonium2 x16 Oil $500 Billion
Yellow GemForgedYellowGem 48 Hour 6 25 Red Gem 25 Green Gem x200 Oil $1.5 Trillion
CatalystForgeCatalyst 5 Min 1 150 Uranium2 75 Plutonium2 x4 Oil $5 Billion

Catalyst Use[]

Each catalyst, when applied to a current craft, will reduce the remaining time for the craft by 20%, stacking multiplicatively, at the cost of using one more slot.

The next section explain this calculation in detail, and then there'll be a table for times, but in short, catalyst should be used:

  • Green gems: Only if using 4+ at a time
  • Purple gems: If using 2+ at a time
  • Yellow gems: Always, as much as wanted

Isotopes efficiency[]

On the line of don't sell isotopes, when you start using catalysts in earnest, you may miss the costs in isotopes. Each Catalyst uses 150 Uranium-2 and 75 plutonium-2. While this is not much in absolute terms, the full Earth production is around 325/hour for each of these isotopes. So every 2 catalysts, you're using 1 hour of your mine's isotopes production. Much more, if you haven't completed Earth yet.

Thus, while catalysts may lower time to almost arbitrary amounts (a Yellow Gem, base 48h, is reduced to 42 min by 19 catalysts, to less than 5 minutes by 29 catalysts, and to 9 seconds by 44 catalysts) you are in a very real way gaining time by burning a limited resource. And at some point, you're not even gaining much time at all.

If you've already reached the reactor, you can partially fix this with tactical use of your fuel rods, which allows you to basically convert U-1 into the rest of isotopes. However, the efficiency of conversion is only 18% at best. So, even considering the ~3500/h production of U-1, after converting to U-2 you only get at most thrice the world's production, i.e. one hour of production for every 6 catalysts. It's up to you to decide if the time and attention needed to juggle this is worth it.

In summary, when the tables below indicate that using two addicional catalysts will lower the crafting time by less than 1 hour, you start burning more isotopes than the time you're gaining. It's up to you to balance time efficiency vs. resource efficiency. The revised recommendation from the above would be:

  • Green gems: Up to 6 catalysts per green gem.
  • Purple gems: Up to 10 catalysts per purple gem.
  • Yellow gems: Up to 15 catalysts per yellow gem.

Time efficiency calculation[]

If you are trying to determine the most efficient use of time, you will want to calculate how many "slot-minutes" are used by a recipe. Building a green gem with no catalysts runs for 240 minutes and uses 3 slots, for a total cost of 720 slot-minutes. Building a green gem with 10 catalysts runs for 25.75 minutes and takes 13 slots, for a cost of 335 slot-minutes. Building the catalysts takes 5 slot minutes each, or a total of 50 slot minutes for 10 catalysts. The overall cost is 385 slot minutes.

Red and Blue gems (and of course, catalysts themselves) should never be built with catalysts. Once you start adding 5 minutes per catalyst for the cost of making the catalysts, the overall efficiency goes down with every catalyst you add. Not only that, but you increase the slots more than it's worth. E.g. for Blue, the first catalyst reduces the time to 24 min, but increases slot use to 3. Slot/min was 30*2 = 60. Now it's 24*3+5=77. For the next catalyst, the actual slot/min is 87, and it gets worse the more you add.

For Green gems (3 slots), the first three catalysts worsen the time (base is 240*3 = 720, with 1 catalist is 192*4+5=773), but from the fourth catalist onwards this improves over the original (708 slot-min for 4 catalists, 483 for 8 catalysts, etc). Of course, making green gems one at a time requires more babysitting, so I think it is up to each person to decide if it is worth it or not. If the other costs (oil, Pu, and U) are not important (at some point of the game, they aren't), then it may be worth it

For Purple gems (4 slots), the first catalysts worsens the time a little (base is 960*4 = 3840 slot-min, 1 catalyst leaves it at 3845), but from there it's all improvement (3165 with 4 catalysts, 1972 with 8 catalysts, etc).

For Yellow gems (6 slots), catalysts are always worth it.

Babysitting tables[]

Once it's worth to use a certain number of catalysts, it's worth (in time) to fill your Forge with them and make gems one at a time. However, keep in mind:

  • Babysitting: It's bothersome to check the Forge every N minutes (specially if you're not playing active).
  • Timelapse: The less minutes it takes, the more minutes you waste when you get a fixed time timelapse (a classical problem when crafting Catalysts and Red Gems).
  • The time and attention needed to craft the Catalysts themselves (both timelapse and babysitting problems)
  • The isotopes consumption (specially if applied to Green Gems).

As you can see, the time quickly becomes negligible. Tables show # of catalysts needed to go down to 10 min. Background is red for catalyst combinations that worsen efficiency.

Green Gems Purple Gems Yellow Gems
# Cat Min Hour Slot-min
0 240 4,00 720
1 192 3,20 773
2 154 2,56 778
3 123 2,05 752
4 98 1,64 708
5 79 1,31 654
6 63 1,05 596
7 50 0,84 538
8 40 0,67 483
9 32 0,54 432
10 26 0,43 385
11 21 0,34 344
12 16 0,27 307
13 13 0,22 276
14 11 0,18 249
# Cat Min Hour Slot-min
0 960 16,00 3840
1 768 12,80 3845
2 614 10,24 3696
3 492 8,19 3456
4 393 6,55 3166
5 315 5,24 2856
6 252 4,19 2547
7 201 3,36 2250
8 161 2,68 1973
9 129 2,15 1720
10 103 1,72 1493
11 82 1,37 1292
12 66 1,10 1116
13 53 0,88 962
14 42 0,70 830
15 34 0,56 717
16 27 0,45 620
17 22 0,36 539
18 17 0,29 470
19 14 0,23 413
20 11 0,18 366
# Cat Min Hour Slot-min
0 2880 48,00 17280
1 2304 38,40 16133
2 1843 30,72 14756
3 1475 24,58 13286
4 1180 19,66 11816
5 944 15,73 10406
6 755 12,58 9090
7 604 10,07 7887
8 483 8,05 6805
9 387 6,44 5843
10 309 5,15 4998
11 247 4,12 4261
12 198 3,30 3622
13 158 2,64 3073
14 127 2,11 2603
15 101 1,69 2203
16 81 1,35 1863
17 65 1,08 1577
18 52 0,86 1335
19 42 0,69 1133
20 33 0,55 963
21 27 0,44 822
22 21 0,35 705
23 17 0,28 608
24 14 0,23 528
25 11 0,18 462

Note: if you don't care about isotopes use, or need to upgrade weopawn fast, the catalyst required for maximum efficiency (in slot-min) for gems at different forge levels are (counting the time it takes to make the catalyst):

Gem Efficiency
Forge Level Green Gems Purple Gems Yellow Gems
1 0 (720 slot-min) 2 (3696 slot-min) 0 (17280 slot-min)
2 5 (654 slot-min) 4 (3165 slot-min) 2 (14756 slot-min)
3 9 (432 slot-min) 8 (1972 slot-min) 6 (9090 slot-min)
4 17 (193 slot-min) 16 (620 slot-min) 14 (2603 slot-min)
5 22 (154 slot-min) 21 (326 slot-min) 19 (1133 slot-min)
6 25 (150 slot-min) 26 (217 slot-min) 24 (528 slot-min)
7 25 (150 slot-min) 31 (188 slot-min) 29 (301 slot-min)
8 25 (150 slot-min) 32 (187 slot-min) 34 (228 slot-min)
9 25 (150 slot-min) 32 (187 slot-min) 38 (216 slot-min)
10 25 (150 slot-min) 32 (187 slot-min) 38 (216 slot-min)

IMPORTANT: Once you reach a certain amount of catalysts, using more catalysts worsens efficiency, even for yellow gems. If you have extra slots, you can use them to craft catalysts/red/blue gems.

Forge Upgrades[]

Depending on your play style, you may not need to upgrade the Forge to maximum. The Gems stop being useful when you max all of your weapons, and this may happen sooner.

Level Workload Slot Cost for next upgrade
1 6 $1 Trillion & 16 Oil & 5 Building Materials
2 8 $4 Trillion & 100 Oil & 15 Building Materials
3 12 $40 Trillion & 2,000 Oil & 30 Building Materials
4 20 $400 Trillion & 4000 Oil & 80 Building Materials
5 25 $5 quadrillion & 6,000 Oil & 160 Building Materials
6 30 $100 quadrillion & 8,000 Oil & 320 Building Materials
7 35 $1 Quintillion & 11,000 Oil & 500 Building Materials
8 40 $50 Quintillion & 15,000 Oil & 750 Building Materials
9 45 $1 Sextillion & 20,000 Oil & 1000 Building Materials
10 50 Max Level
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