The pen is the income building. Official text says PCs in the pen earn money, and upgrading the pen is one of the two upgrades you buy, alongside the treadmill. Rarer PCs produce more than common ones. There is no public table that turns every rarity name into one cash rate, so read the number on the PC you just unboxed.
Slots
A slot holds either a box that is hatching or a PC that is earning. When the pen is full, placement is blocked. One exact line is Pen full (13/13)! Upgrade it at the board. The fraction changes with your level.
Open Upgrade Pen on the base board. It shows the current level, the next level, slots in use, and the price.
| Change | Reported price | Slot change |
|---|---|---|
| Level 7 to 8 | $24M | 12 to 13 |
| Level 8 to 9 | $320M | 13 to 14 |
The Level 8 to 9 jump costs more than thirteen times the previous tier and still adds one slot. At that price, replacing a weak PC often raises income faster than saving for the extra slot. Prices below Level 7 and above Level 9 were not in the same report.
After a successful Level 7 to 8 purchase, the game says Pen upgraded! 13 slots unlocked – your pen got bigger!
Which PC to keep
These are single recorded rates, not a price list. They were not all taken in the same session, so do not subtract them as if they share one patch.
| PC | Recorded rate | Context |
|---|---|---|
| Meadow Gaming PC | $160/s | Early named example |
| Sandstone | $6.62K/s | Shown beside other placed PCs |
| Toadstool PC | $6.97K/s | Shown beside other placed PCs |
| Disco Dune PC | $10.9K/s | Hatched from a Disco Desert Box |
| Sundial PC | $23K/s | Higher than the Toadstool and Sandstone examples |
| Redline PC | $500M/s | Shop offer for 39 Robux, not a zone drop |
Adding that Disco Dune PC moved one base from $25.6K/s to $31.1K/s. The spread is the point: a pen full of weak PCs can lose to a smaller set of stronger ones.
Equip Best fills slots with your best earners. Cable PC is identified as Legendary, and Sealed PC is a named passive earner, but neither has a published base rate. A Secret PC has been described around $1.1 billion per second without a stable name, so that figure is not a Secret-tier standard.
Community Pc is the item named on the DISCORDGIFT code. Its income is not listed.
Offline and the Index
The earnings banner says the base earns offline, so placed PCs keep counting after you leave through the Roblox menu. Run Equip Best and fill the slots you want before you log out.
The Index button tracks which PCs you have found. Use it to see what a zone still has not given you. It is not a shop.
What the pen does not do
Speed does not change the rate printed on a PC. A trail does not change it either. A pen upgrade adds room and, in the official description, improves how fast you earn, but the only slot math published in detail is +1 slot at the two tiers above. If your board shows a different income bonus, trust the board.