Correlated randomness in Slay the Spire 2

Researchers and players have identified that the pseudorandom number generators in Slay the Spire 2 are correlated, leading to predictable outcomes in specific game events, such as relic effects and initial combat drops. This revelation has implications for player strategy and the game’s randomness integrity.The core discovery is that the game’s multiple RNGs are initialized with seeds that are correlated, meaning that knowing the output of one RNG can help predict the outputs of others. This correlation affects various game mechanics, including the likelihood of receiving certain curses when selecting Neow’s Bones relic and the probability of potion drops at the start of runs. The phenomenon, known as ‘correlated RNG’ or CRNG, was identified through community analysis and confirmed with data from the current beta patch (v0.107.0). For example, players have observed that choosing Neow’s Bones often results in the curse Debt more than half the time, a pattern that aligns with the predicted RNG behavior. Experts note that this correlation stems from the way the game seeds its multiple RNGs, which are initialized with related seed values, making their outputs partially predictable. This issue mirrors a similar problem in the original Slay the Spire, where RNGs shared a starting state, allowing players to exploit predictable outcomes. The current findings suggest that the game’s randomness may be less random than intended, especially in early game events and relic effects.

Impact of RNG Correlation on Game Strategy and Fairness

The discovery that Slay the Spire 2’s RNGs are correlated has significant implications for gameplay fairness and strategy. Players can potentially exploit this predictability to optimize relic choices, combat outcomes, and event results. It also raises concerns about the integrity of the game’s randomness, which is a core element of the game’s challenge and replayability. For competitive players and those seeking a fair experience, understanding these RNG patterns could alter how they approach the game. Developers may need to address this issue to restore true randomness and ensure balanced gameplay, especially in multiplayer or competitive contexts.

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Previous RNG Issues in Slay the Spire and Changes in Version 0.107.0

The original Slay the Spire faced similar RNG problems, where multiple RNGs shared the same seed, enabling exploitation of predictable outcomes. In response, Spire 2 was designed to initialize its RNGs with distinct seeds based on different hash functions, aiming to prevent such exploitation. However, recent community analysis indicates that the seeding method still results in correlated outputs due to the underlying linear nature of the RNG algorithm used (C#’s System.Random). The beta patch v0.107.0 introduced these new RNG systems, but the issues with correlation have only now been fully analyzed and understood by the community. This ongoing investigation highlights that, despite efforts to improve randomness, the underlying algorithm’s linearity can still produce exploitable patterns, especially early in the game or when specific relics are involved.

“The correlation between the RNGs means that knowing the first output gives us a surprising amount of information about subsequent random events, which shouldn’t happen in a truly random system.”

— Community researcher

Extent and Impact of RNG Correlation on Overall Gameplay

While specific examples demonstrate the correlation’s effect on certain relics and early game events, the full scope of its impact across all game mechanics remains unclear. It is not yet confirmed whether the correlation significantly influences later stages or more complex scenarios, and whether future updates will fully resolve the issue.

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Developer Response and Potential Fixes for RNG Correlation

Developers are expected to investigate the RNG seeding process further and may implement changes to eliminate correlation, such as adopting more robust randomization algorithms. Community feedback and additional data collection will likely inform upcoming patches aimed at restoring true randomness. Players should stay tuned for updates that address these issues, especially before competitive or high-stakes gameplay.

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Key Questions

How does RNG correlation affect my gameplay?

It can make certain outcomes, like relic effects or initial drops, more predictable, potentially allowing players to exploit patterns for better results.

Is this issue limited to beta versions?

The correlation has been confirmed on the current beta patch (v0.107.0), but it is unclear if it affects the stable release or future updates.

Can players do anything to avoid RNG correlation?

Currently, no. The issue stems from the game’s underlying RNG system, which developers may address in future patches.

Will this problem be fixed in upcoming updates?

Developers have acknowledged the issue and are investigating solutions, but no specific timeline has been announced.

Does this mean the game is unfair or broken?

While it introduces predictability in some cases, the overall gameplay remains balanced. The main concern is the potential for exploitability and fairness in competitive contexts.

Source: Hacker News