The first real wall
The Prehistoric biome sits behind an 18 million speed sign (one sign read 17M in an older version) and is guarded by a T-Rex that roars loudly enough to make creators flinch. It's the first true wall in Steal an Egg: the jump from the Abyss Ocean's 2.5M is about 7x, and the T-Rex punishes anyone who thinks "just over the sign" is enough.
How the T-Rex behaves
The T-Rex is fast and pushes you back when it catches you. Real experiences from the runs we watched:
- At 18.1M speed, just over the sign, one creator failed repeatedly on a big egg: "Surely I can grab this big egg… What?" They wondered if jumping made a difference.
- At 50M they were still getting caught on big eggs: "How is this dude keep destroying me when I've got 50 million speed?"
- At about 70M, with a 3x trail and max multipliers, they finally carried a big one home: "I think I finally got enough speed to get away from him."
- A different player juked the T-Rex with only 2.7M speed by zigzagging with a small egg: "I legit didn't think this was going to work."
The takeaway: small Prehistoric eggs are fine at 18M. Big ones need several times the sign, or a trick.
The Prehistoric egg pool
- Brontosaurus: the most common egg ("I've seen this egg so many times"). Big ones reach 249,000 kg.
- Dodo: mythic, about $100K. "Duck thing" according to one confused creator.
- Ankylosaurus: about $112K.
- Pterodactyl: the legendary.
- T-Rex: the secret, announced as "a secret T-Rex spawned in the prehistoric".
- Mosasaurus: the best egg, from the "monstrous" egg, $139–180M base.
The Mosasaurus
The Mosasaurus is the Prehistoric anchor pet, a sea reptile with a 6-hour timer. Readings:
| Copy | Income |
|---|---|
| Average | $139M |
| Basic (creator test) | $180M |
| 24,000 kg | $159M |
| Golden | $450M |
| Rainbow | $630M |
| Massive server-reset find | $2.3B |
Eternal Mosasaurus eggs also appear in rifts. One night a rift spawned "an eternal Mosasaurus egg", alongside a secret.
Mosasauruses are also popular Fuse Machine fodder because they're common: three small ones can roll into a bigger one, though most fuses came out "kind of midsize".
Why the Prehistoric matters so much
Two reasons. First, the Mosasaurus is the first pet that lets a mid-game account cross a billion per second with a mutation or a big egg. Second, the next biome, Cosmic, needs 700 million speed, nearly 40x the Prehistoric sign. You'll spend a long time here, so the income you build in the Prehistoric is what pays for the Lucky Block treadmill ($75B) and Galaxy trail that get you through.
One server-hop player used their Mosasaurus as a benchmark: "We have stuff from the prehistoric area forward… meaning anything here forward is good enough to try resetting servers for."
Tips
- Overshoot the sign before going for big eggs (50–70M+).
- Steal while the T-Rex is busy. "Since the dinosaur is busy on me, the other guy should be able to take out the prehistoric area."
- Watch for rifts at night for eternal Mosasauruses.
- Admin Abuse's T-Rex mini game is a different thing: dodge waves of T-Rexes for a prize egg.
Prehistoric facts at a glance
- Speed needed: 18 million
- Guardian: T-Rex (loud, fast, pushes you back)
- Top rarity: Eternal (Mosasaurus)
- Secret: T-Rex
- Next jump: ~40x to Cosmic
Back to all biomes or on to Cosmic.