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Steam News3 November 20258mo ago

Rattus Velocitas update released

G'day Rat Racers! This update contains bugfixes and an adjustment to performance-based CPU difficulty. Introduced win-rate based CPU difficulty adjustment for Quick Race.

Full notes

Full Rattus Velocitas update

Read the full published notes in a cleaner layout. The original post stays linked below.

What changed

3 fixes1 addition2 changes0 removals
  • Performance
  • Balance
  • Server
  • Fixes
changedThis update contains bugfixes and an adjustment to performance-based CPU difficulty.
addedIntroduced win-rate based CPU difficulty adjustment for Quick Race. This replaces performance-ratio based CPU difficulty. Algorithm for this is simple; if you're routinely failing to place the top 3, you'll get easier opponents, and vice versa. This alleviates an issue where the performance ratio's boost percentage would droop too low and end up giving the player easier CPU opponents after a few races with next to no boosts present. Note that this means your first Quick Race after the update installs will be ridiculously easy, then it should even out as you play more races.
changedImproved cross-client Cheese Rocket drop RNG in online races. Item drop rates from Cheese Rockets should now have a random chance close to offline races.
fixedFixed an issue where it was possible for every player to get the same item in the first cluster of Cheese Rockets in an online race due to latency.
fixedFixed a bug that made CPUs "sleep on the job" even at maximum difficulty with their first acquired item - now they should react a bit faster to getting the first one. In addition, lowest CPU difficulty shouldn't react too fast to getting the first item now.
fixedFixed a regression from the "CVE found, urgent update required" patch where the game was accidentally passing [c]int.MaxValue [/c]to several stat-keeping functions, resulting in the Steam Achievements "Podium Finish," "Does this guy even touch grass?" and "Better Luck next time" not functioning properly. (Sorry about that!) Note that this requires placing 1st in at least one race after installing this update to unlock the Podium Finish Achievement correctly.

Rattus Velocitas changes

changedThis update contains bugfixes and an adjustment to performance-based CPU difficulty.
addedIntroduced win-rate based CPU difficulty adjustment for Quick Race. This replaces performance-ratio based CPU difficulty. Algorithm for this is simple; if you're routinely failing to place the top 3, you'll get easier opponents, and vice versa. This alleviates an issue where the performance ratio's boost percentage would droop too low and end up giving the player easier CPU opponents after a few races with next to no boosts present. Note that this means your first Quick Race after the update installs will be ridiculously easy, then it should even out as you play more races.
changedImproved cross-client Cheese Rocket drop RNG in online races. Item drop rates from Cheese Rockets should now have a random chance close to offline races.
fixedFixed an issue where it was possible for every player to get the same item in the first cluster of Cheese Rockets in an online race due to latency.
fixedFixed a bug that made CPUs "sleep on the job" even at maximum difficulty with their first acquired item - now they should react a bit faster to getting the first one. In addition, lowest CPU difficulty shouldn't react too fast to getting the first item now.

G'day Rat Racers!

This update contains bugfixes and an adjustment to performance-based CPU difficulty.

  • Introduced win-rate based CPU difficulty adjustment for Quick Race. This replaces performance-ratio based CPU difficulty. Algorithm for this is simple; if you're routinely failing to place the top 3, you'll get easier opponents, and vice versa. This alleviates an issue where the performance ratio's boost percentage would droop too low and end up giving the player easier CPU opponents after a few races with next to no boosts present. Note that this means your first Quick Race after the update installs will be ridiculously easy, then it should even out as you play more races.

  • Improved cross-client Cheese Rocket drop RNG in online races. Item drop rates from Cheese Rockets should now have a random chance close to offline races.

  • Fixed an issue where it was possible for every player to get the same item in the first cluster of Cheese Rockets in an online race due to latency.

  • Fixed a bug that made CPUs "sleep on the job" even at maximum difficulty with their first acquired item - now they should react a bit faster to getting the first one.

    • In addition, lowest CPU difficulty shouldn't react too fast to getting the first item now.

  • Fixed a regression from the "CVE found, urgent update required" patch where the game was accidentally passing [c]int.MaxValue [/c]to several stat-keeping functions, resulting in the Steam Achievements "Podium Finish," "Does this guy even touch grass?" and "Better Luck next time" not functioning properly. (Sorry about that!) Note that this requires placing 1st in at least one race after installing this update to unlock the Podium Finish Achievement correctly.

Source

Steam News / 3 November 2025

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