Radon

Radon

Radon is a resource unlocked after beating the Dimension of Rage, a unique map that is created by buying Rage, an upgrade awarded for completing zone 15 in Universe 2 , the Radon Universe. It functions exactly the same as Helium in Universe 1, allowing you to purchase Perks exclusive to Universe 2. Along with Radon the player also unlocks the Portal, which allows for soft-resetting your game. Perks and Radon last throughout Portals. Clearing the Dimension of Rage and using the Portal for the first time in Universe 2 enables the collection of Void Maps in future runs.

How to get Radon

There are currently five known ways to get Radon:

1. Complete the Dimension of Rage (or use the Portal Generator). This gives 45 Radon, not modified by anything.
2. Kill a Blimp or Improbability, on zone 16 or later, after having completed the Dimension of Rage at least once in your save. Blimps that spawn before zone 16 do not drop Radon. All zones after 15 will have a Radon-carrying boss imp.
3. Kill the Cthulimp at the end of a Void map.
4. Kill Mutated enemies in the Mutated zones.
5. Buy Bone Portals in the Bone Trader menu for 100 Bones each, while in the Radon Universe. The Radon awarded corresponds to the highest amount ever obtained in a single run. Unlike Radon from other sources, this Radon can be immediately spent on Perks.

Radon obtained from methods 1-4 appears in the Radon box below Gems. In order to use the Radon on Perks, you need to use the Portal (soft reset). There is also a Rn/hr below this number, which can be used to assess whether your run is efficient (in gaining Radon) or not. The Rn/hr number keeps track of the total Radon earned in a run over time taken, and does not indicate any sort of passive gain.

Rewards

Note: You must beat The Dimension of Rage at least once in your save file to gain Radon from completing zones. If you've completed Zone 16 or above before doing so, the Radon you would have otherwise gotten is lost. This only matters during the first run.

The base amount of Radon received from each zone boss is calculated using the same formula as Helium. This formula is:

$Rn_\text{base} = 1.35 \cdot (z-19) + 1.23^{\sqrt{1.35 \cdot (z-19)}} \, \text{where} \, z \, \text{is the current Zone}$

If z-19 < 0, the z-19 term is set to 0, meaning the base value degenerates to 1.23^0 = 1. For some calculated values, see the table below.

Level	Enemy	Base Radon
16-19	Blimp	1
20	Improbability	2.62
21	Improbability	4.11
22	Improbability	5.57
23	Improbability	7.02
24	Improbability	8.46
25	Improbability	9.9
26	Improbability	11.3
27	Improbability	12.8
28	Improbability	14.2
29	Improbability	15.6
30	Improbability	17.1
31	Improbability	18.5
32	Improbability	19.9
33	Improbability	21.4
34	Improbability	22.8
35	Improbability	24.2
36	Improbability	25.6
37	Improbability	27.1
38	Improbability	28.5
39	Improbability	29.9
40	Improbability	31.4
41	Improbability	32.8
42	Improbability	34.2
43	Improbability	35.6
44	Improbability	37.1
45	Improbability	38.5
46	Improbability	39.9
47	Improbability	41.4
48	Improbability	42.8
49	Improbability	44.2
50	Improbability	45.7
51	Improbability	47.1
52	Improbability	48.5
53	Improbability	50
54	Improbability	51.4
55	Improbability	52.8
56	Improbability	54.3
57	Improbability	55.7
58	Improbability	57.1
59	Improbability	58.6
60	Improbability	60
61	Improbability	61.5
62	Improbability	62.9
63	Improbability	64.3
64	Improbability	65.8
65	Improbability	67.2
66	Improbability	68.7
67	Improbability	70.1
68	Improbability	71.5
69	Improbability	73
70	Improbability	74.4
71	Improbability	75.9

The actual amount of Radon received will be greatly increased by Radon bonuses from Challenge², Condenser Towers, Looting, etc. One can see the Radon breakdown clearly by clicking on the present icon next to the enemy imps and then clicking on the Radon category. The final Radon after base formulas and bonuses is rounded down.

Most Radon modifiers are simple multipliers -- for example, Looting is an additive +5% bonus per perk level. However, a few of the bonuses are more interesting.

Modifier	What it does
Microchip 5	x (1.005 ^ currentZone)
Scruffy 3	x (1.03 ^ prevPortalZone)
Glass	x (1.1 ^ (currentZone - 175)) if currentZone > 175
Mutated zones	x400 if currentZone > 200
Mass Radon Mutator	x1.5 if currentZone > 200

Void Maps

Clearing a Void Map generally awards twice the amount of Radon from killing the boss at the end of each world zone. The following factors increase the amount of Radon gained from Void Maps:

• Void Specialization I and II, and Master of the Void Masteries
• Scruffy with the Void Map stacking abilities
• Meteorologists hired in a previous zone (those hired in the current zone are not yet active), which increase the amount of Radon earned by 1% (additive). Meteorologists are unlocked each run by clearing cell 20 of zone 30.