Wiki Level Up XP & Levels Every Infect Game Mode run earns XP for your lineage. XP raises your level, and each level pays out skill points for the skill tree. Every virus in the lineage shares the same level and tree.
On this page 9 XP from Infect runs XP from challenges Level curve Skill points per level Bonus skill points from challenges Organ-progress skill point bonuses Respec One shared lineage Generations A finished Infect Game Mode run pays 1 XP per 3 kills, 8 XP per room and 150 XP for a victory.
Formula: kills ÷ 3 (rounded down) + 8 × rooms + 150 if the host fallsA victory means the brain falls and the host is fully infected Pandemic Game Mode and Endless Game Mode runs give no XP and no generations The run summary shows the XP gained and your level before and after From the Codex Your virus's experience and the skills it buys.
Fun fact: Switching to another capstone in the same tree is free: its point moves over.
Levels & Skill Tree in the Codex Every completed challenge also pays XP when you collect its reward.
Easy 6 XP Normal 15 XP Hard 40 XP Elite 100 XP Legendary 220 XP From the Codex Goals that pay rewards.
Fun fact: Collect finished challenges from the menu; during a run you can only view them.
Challenges in the Codex Levels come quickly at first and get steadily steeper: going from level L to L+1 costs 60 + 20L + 4L² XP.
A new save starts at level 0; level 1 takes 60 XP Next steps: 84, 116, 156, 204, 260 XPLevel 9 to 10: 564 XP; level 20 to 21: 2,060 XPTotal XP: level 5 at 620, level 10 at 2,640, level 15 at 7,060, level 20 at 14,880Total XP: level 25 at 27,100, level 30 at 44,720, level 40 at 100,160, level 50 at 189,200There is no level cap From the Codex Your virus's experience and the skills it buys.
Fun fact: Switching to another capstone in the same tree is free: its point moves over.
Levels & Skill Tree in the Codex Each level gives skill points: 1 per level, 2 from level 10, 3 from level 25 and 4 from level 40.
Levels 1 to 9: 1 point each (9 total by level 9)Levels 10 to 24: 2 points each (39 total by level 24)Levels 25 to 39: 3 points each (84 total by level 39)Level 40 on: 4 points each (88 by level 40, 128 by level 50)The deep rows cost more per rank, so the bigger payouts keep them affordable From the Codex Your virus's experience and the skills it buys.
Fun fact: Switching to another capstone in the same tree is free: its point moves over.
Levels & Skill Tree in the Codex Challenges add skill points on top of levelling: Elite challenges pay 1 point, Legendary ones 2, and 16 organ-progress challenges pay 32 more in total.
Bonus points are paid in thirds; leftover thirds carry over until three make a whole point Elite reward: 1 skill point; Legendary reward: 2 skill pointsOrgan-progress bonuses total 32 points, weighted toward organs 1 to 4 From the Codex Goals that pay rewards.
Fun fact: Collect finished challenges from the menu; during a run you can only view them.
Challenges in the Codex These milestone challenges pay extra skill points on top of their normal reward.
Mast Cell Slayer +3, Mast Cell Nemesis +1, Into the Lungs +1 Alveolar Macrophage Slayer +2, Alveolar Macrophage Nemesis +1, Into the Bloodstream +2 Plasma Cell Slayer +3, Plasma Cell Nemesis +2, Into the Lymph Node +3 Follicular Helper T Cell Slayer +4, Follicular Helper T Cell Nemesis +3, Into the Gut +3 Paneth Cell Slayer +1, Into the Liver +1 Kupffer Cell Slayer +1, Hematopoietic Stem Cell Slayer +1 From the Codex The giant immune cell guarding the way to the next organ.
Fun fact: From the third organ on, every boss also has a signature skill on its own random clock, aimed at you.
Bosses in the Codex Refund every skill point in the tree for RNA: 1 RNA per 5 points spent, rounded up (minimum 1).
Example: 23 points spent costs 5 RNA; a fully maxed tree (538 points) costs 108 RNAAll ranks are cleared and your equipped active skill is unequipped RNA only drops in Pandemic Game Mode From the Codex Ribonucleic acid: a single-stranded cousin of DNA that carries genetic messages and, in many viruses, the whole genome.
Fun fact: Some RNA molecules can act as enzymes (ribozymes), which hints that early life may have run on RNA alone.
RNA in the Codex Every virus your lineage becomes shares one level, one skill tree, one Petri Lab, one gear bag and one record of reached organs.
A generation's mutation decides which virus it is Switching virus never resets XP, skills or Lab levels From the Codex The viruses you can play, each with its own style.
Fun fact: A generation's mutation decides its virus: some mutations turn the lineage into a different one.
Virus Classes in the Codex Each finished Infect Game Mode run ends a generation and adds it to your lineage; deeper unlocks need more finished generations.
Abandoning a run does not end the generation: it plays again next run Skill tree rows ask for up to 10 finished generations Several features also ask for 2 to 5 generations From the Codex What your virus passes on to the next generation.
Fun fact: Inheriting the same strain again stacks it and makes it stronger.
Strains & Lineage in the Codex 
