Cell to Singularity Wiki

The Mesozoic Valley is a side simulation featuring the evolutionary history of prehistoric creatures throughout the Mesozoic Era. It primarily includes various species of dinosaur, but also includes some non-dinosaur prehistoric creatures. This expansion explores the evolution of dinosaurs from archosaurs, through their extinction in the Cretaceous-Paleogene Extinction Event, and into their eventual evolution into modern birds.

This part of the game is represented by mascot Archie the Archosaur.

Mesozoic Valley[]

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A Mysterious Rock appears on the Main Tree once the Flatworm is unlocked. Repeatedly tapping on the Rock destroys it and unlocks the Mesozoic Valley: a new, separate simulation, in which a separate tech tree can be found. Advancing this second simulation provides speed increases to the main simulation, and eventually unlocks additional generators.

The Mesozoic Valley begins with a single dinosaur node, with more species unlocking as you advance in rank. Clicking the screen will generate Fossil Points at the rate of one per click, but they can be gained at a faster rate by clicking the arrow button on top of each dinosaur node in the tree to 'charge' the node. Tapping the dinosaur itself allows you to purchase more copies of the dinosaur, which increases the payout from each charge.

Dinosaurs will not automatically generate fossils without tapping until you unlock the corresponding Trait Cards. These traits automate production of Fossils for each dinosaur, removing the need to tap on the arrow button and increasing the productivity of each dinosaur. Trait Cards are improved and upgraded using Mutagen, a currency gained by purchasing a certain number of dinosaurs, but must first be unlocked by collecting the cards from Geodes.

At the top of the screen are quests, which give the player goals like "Collect 25 Stegosaurus", "Upgrade 3 Traits", and "Photograph Archosaur". Three quests are displayed at a time, and with each rank more quests are required to be completed to advance to the next level. Once a quest is completed, the player will receive a Stone Geode containing Mutagen and Trait Cards.

After completing enough quests for each rank of the Mesozoic Valley, you have the option to trigger an Extinction Event (although there will typically be additional quests remaining, which you can optionally complete for extra rewards). When this happens, an asteroid falls from the sky, wiping out your dinosaurs and restarting the valley in a fashion similar to the reboot triggered by the first Singularity. This allows the player to unlock new dinosaurs. It will also give you a Silver Geode, and increase the valley's Simulation Level by 1. Each additional rank of the Mesozoic Valley will increase the speed of the main simulation with diminishing returns; the speed multiplier is 1 + (rank / 10), so rank 1 gives a 1.1x multiplier, rank 2 gives 1.2x, up to rank 50 giving 6x. Reaching certain ranks will also unlock additional bonus generators for the main sim.


At rank 50, the "Asteroid" button changes to a "Prestige" button, allowing you to reboot the Mesozoic Valley in exchange for one Warm Climate Trait card at level one, which provides a 50% bonus to payout from all dinosaurs. Epic and rare traits are saved, and so is Mutagen, but common Trait cards are set to zero. Rank is incremented to prestige rank 1, which retains the multiplier for the main simulation (so the multiplier is now x6.1), and the reptile generators remain unlocked.

The maximum number of prestiges is 10. It is generally advisable to stockpile as much Mutagen as possible along the way, so that you can advance your dinosaurs as far as possible.

Types of Dinosaurs[]

The following table shows some info about the Dinosaurs. "Cost" indicates the amount of Fossils needed to buy the first copy of each dinosaur. The cost increases by 15% (compounding) each time a new copy is bought. The cost can be decreased by obtaining rare or epic Traits.

"Gain" is the cost of Fossils per dinosaur that are obtained each time the dinosaur cycle finishes. This amount increases when the corresponding payout Traits are activated.

"Duration" is the initial time for one cycle to be completed. It can be decreased by activating Traits. By activating the first duration decreasing Trait, the dinosaur cycle is automated. Once the cycle becomes extremely short, it is replaced with a simple fossil rate per second.

"Unlock" is the rank needed to be able to buy the first copy of the dinosaur.

"Trait" is the ranks that are needed to unlock the single dinosaur Traits; automation/speed followed by payout.

Dinosaur Base Cost Base Gain Base Duration Unlock Trait
Archosaur 3.74 1 0.6s Lvl 1 2, 4
Ornithischia (Parasaurolophus) 60 60 3s 2, 6
Stegosaurus 720 720 6s 3, 6
Ankylosaurus 8,640 4,320 12s Lvl 2 3, 5
Triceratops 103,680 51,840 24s Lvl 3 4, 8
Pterosaur 1.24 M 207,360 18s Lvl 4 5, 10
Plesiosaur 14.93 M 2.2 M 36s Lvl 6 7, 12
Saurischia (Ceratosaurus) 179.16 M 5.16 M 14s Lvl 8 9, 12
Sauropoda (Apatosaurus) 2.15 B 235.82 M 120s Lvl 10 11, 14
Theropoda (Dilophosaurus) 25.80 B 167.8 M 16s Lvl 12 13, 16
Compsognathus 309.58 B 223.69 M 4s Lvl 14 15, 18
Velociraptor 3.72 T 6.71 B 20s Lvl 16 17, 19
Pachycephalosaurus 44.58 T 71.58 B 40s Lvl 18 19, 22
Gallimimus 534.97 T 76.36 B 8s Lvl 20 21, 24
Archaeopteryx 6.42 Qa 1,53 T 30s Lvl 22 23, 26
Brachiosaurus 77.04 Qa 61.06 T 200s Lvl 24 25, 28
Tyrannosaurus Rex 924.42 Qa 162.82 T 100s Lvl 26 27, 28
Spinosaurus 11.09 Qi 782.86 T 90s Lvl 28 29, 30
Iguanodon 133.12 Qi 2.23 Qa 48s Lvl 30 31, 32
Ichthyosaur 1.60 Sx 7.41Qa 30s Lvl 33 34, 35
Cynodont (Thrinaxodon) 19.17 Sx 26.36 Qa 20s Lvl 36 37, 38
Eoraptor 230.02 Sx 281.16 Qa 40s Lvl 39 40, 41
Mosasaurus 2.76 Sp 9.00 Qi 240s Lvl 42 43, 44
Argentinosaurus 33.12 Sp 63.98 Qi 320s Lvl 45 46, 47
Giganotosaurus 397.5 Sp 533.16 Qi 500s Lvl 48 49, 50

Traits (incomplete)[]

Traits are cards that can upgrade dinosaurs at the cost of Mutagen. When you open Geodes, you can gain a mix of Mutagen, Darwinium, and Traits. You can also watch "Mystery Trait" ads to gain cards for a single random trait.

Common traits affect a single dinosaur. Rare traits affect a whole category of dinosaurs, such as "all carnivores" or "all bipeds". Epic traits affect every dinosaur.

Trait Paths[]

For each Trait, as you level it up using more cards, it will follow one of a few different paths:

Speed Path[]

  • The first upgrade automates a dinosaur so it will produce fossils without tapping.
  • Further upgrades double production speed.

Payout Path[]

Doubles payout each upgrade.

Cost Path[]

Reduces the purchase price of each dinosaur. Only comes from Rare and Epic traits.

Fossil Tap Path[]

The Rare "Ammonoidea" trait is a special case, increasing the payout from tapping the screen.


Trait upgrades also have an associated cost, as follows:

Upgrade No. Copies Required Cost & Rate Increase Rate Increase for Epic Cards
1 1 10 Mutagen (x 2) x 1.5
2 2 50 Mutagen (x 4) x 2
3 5 100 Mutagen (x 8) x 2.5
4 10 200 Mutagen (x 16) x 3
5 20 300 Mutagen (x 32) x 3.5
6 50 400 Mutagen (x 64) x 4
7 100 1,000 Mutagen (x 128) x 4.5
8 200 2,000 Mutagen (x 256) x 5
9 400 4,000 Mutagen (x 512) x 5.5
10 800 8,000 Mutagen (x 1024) x 6
11 1,000 20,000 Mutagen (x 2048) x 6.5
12 2,000 50,000 Mutagen (x 4096) x 7
13 5,000 100,000 Mutagen (x 8192) x 7.5
14 10,000 200,000 Mutagen (x 16384) x 8
15 and more 10,000 400,000 Mutagen (x2 by level) +0.5 by level

The current (11/2020) maximum level for a card upgrade is 20.

Trait Cards[]

Common traits[]

Dinosaur Speed Path Payout Path
Archosaurs Opisthopubic Pelvis Propubic Pelvis
Ornithischia Predentary Bone Duckbills
Stegosaurus Armor Flat Teeth
Ankylosaurus Tail Club Ossification
Triceratops Nose Brow Horns Frill
Pterosaurs Wings Extended Finger
Plesiosaurs Aquatic Diapsid Flippers
Saurischia Mobile Neck Upright Posture
Sauropoda Rapid Tooth Replacement Gastroliths
Theropoda Grasping Hands Sharp Teeth
Compsognathus Small Bodies Sharp Eyesight
Velociraptor Sickle Shaped Claw Pack Hunting
Pachycephalosaurus Hard Head Olfactory Lobes
Gallimimus Nest Building Three-toed Feet
Archaeopteryx Bird Brain Flight Feathers
Brachiosaurus Long Tails Pencil-like Teeth
Tyrannosaurus Rex Alpha Predator Brawny Neck
Spinosaurus Spines Semi-Aquatic
Iguanodon Thumb Spikes Changing Posture
Ichthyosaur Live Birth (Viviparous) Large Eyes
Cynodont Burrowing Whiskers
Eoraptor Heterodont Dentition (Omnivore) True Fossil
Mosasaurus Double-Hinged Jaw Scales
Argentinosaurus Accelerated Growth Giant Vertebrae
Giganotosaurus Giganotothermy Jaw Articulation

Rare traits[]

- Bipedal - Rare - Speed path for dinosaurs with the Bipedal trait.

- Quadrupedal - Rare - Speed path for dinosaurs with the Quadrupedal trait.

- Ammonoidea - Rare - Increases clicking payout.

- Herbivore - Rare - Payout path for dinosaurs with the Herbivore trait.

- Carnivore - Rare - Payout path for dinosaurs with the Carnivore trait.

- Parallel Evolution - Rare - Speed path for dinosaurs with the Parallel Evolution trait.

- Aquatic - Rare - Speed path for dinosaurs with the Aquatic trait.

- Triassic Age - Rare - Discounts price for dinosaurs with the Triassic Age trait.

- Jurassic Age - Rare - Discounts price for dinosaurs with the Jurassic Age trait.

- Cretaceous Age - Rare - Discounts price for dinosaurs with the Cretaceous Age trait.

Epic traits[]

- Herd Behavior - Epic - Payout path for all dinosaurs (at a slower rate than common payout paths)

- Hollow Bones - Epic - Speed path for all dinosaurs (at a slower rate than common payout paths)

- Feathers - Epic - Discounts price for all dinosaurs

- Warm Climate - Epic - Increase dinosaur payout x1.5


Mutagen is earned by reaching production targets for each species of dinosaur, and unlocking Geodes.

Geode payouts are randomized, but increase with your simulation rank. Production rewards are fixed in value, but paid separately for each species, so unlocking more species gives you access to more rewards.

Dinosaur count Reward
10 2
25 4
50 6
100 10
150 20
250 40
500 60
600 80
800 100

Unlocking in primary simulation[]

Reaching certain ranks will unlock the following generators for the primary simulation as part of the Rise of Reptiles branch:


  • Pterosaurs, Plesiosaurs, Mosasaurus, and Ichthyosaurus are not dinosaurs, which is why they are offshoots of the Archosaur node separate from the mainstream dinosaurs. These creatures belong to sister clades of dinosaurs.
  • Despite their origins in different clades, the Mosasaur, Plesiosaur, and Ichthyosaur are grouped together as the only aquatic prehistoric creatures on the tree.
  • The Cynodont is also not a type of dinosaur, but a proto-mammal. Dinosaurs and other Archosaurs (such as the above-listed creatures) are Diapsids whilst Cynodonts are Therapsids. These non-dinosaur creatures are included in the Mesozoic Valley to show the diversity of species during the era, as an example of the other organisms alive at the time.