How do I find which version introduced a regression?

Compare per-version data to find the build where the previously-working behavior started failing, that version is where the regression was introduced, and its changes contain the cause. A regression is something that worked before and broke, so it was introduced at a specific point, a release whose changes broke it, and finding that release is the key to finding the cause. The way to find it is per-version comparison: look at your crash and issue data per version and find the build where the regression first appears (the crash that wasn't there before now present, or the behavior that worked now failing). That version is where the regression was introduced, the release whose changes caused it. For a crash regression, the crash signature appearing on a specific version (and absent on prior ones) pinpoints the introducing build. For a behavioral regression, the reports or the behavior changing as of a version do the same. Once you've identified the introducing version, you've narrowed the cause to that release's changes (the code, assets, or dependency changes in it), which you examine to find the specific change responsible (a bisection through the release's changes, or reasoning from where the regression manifests). So you find which version introduced a regression by comparing per-version data to identify the build where the previously-working behavior started failing, then examining that release's changes for the cause. Bugnet tracks crashes and issues per version, so you can see which build a regression first appears on (the introducing version), isolating the cause to that release's changes, and provides the captured context (stack trace, conditions) showing where the regression manifests, helping you connect it to the specific change, so you can find both when the regression was introduced and what caused it, then roll back or fix it and verify per version it's resolved.

How do I fix a regression?

Identify the change that caused it (via the introducing version and where it manifests), then roll back or fix that change, and verify per version that the regression is resolved without reintroducing it or causing a new one. Fixing a regression follows from finding its cause. First, find the introducing version and cause: compare per-version data to find the build where the regression appeared (the introducing release), and examine that release's changes plus where the regression manifests (the captured stack trace/context) to identify the specific change responsible, as covered above. Second, decide roll back or fix: if the regression is serious and a fix will take time, roll back, revert the introducing release (or just the responsible change) to restore the previously-working state, then fix properly without pressure, if you can fix the responsible change quickly, fix it, correcting what the change broke while keeping the rest of the release. The choice depends on severity and fix speed. Third, fix the actual cause: address the specific change that caused the regression (correct the code that broke the behavior, restore what was lost, fix the interaction the change introduced), targeting the root, not a symptom. Fourth, verify per version: confirm the regression is resolved (the previously-working behavior working again, the regression's crashes gone) on the fixed build, and crucially, check you didn't reintroduce the original issue or cause a new regression with your fix (a risk when fixing). So you fix a regression by identifying the responsible change, rolling back or fixing it, and verifying per version that it's resolved without a new problem. Bugnet tracks per version with full context, so you can find the introducing version and the change responsible, verify the regression is resolved on the fixed build (the previously-working behavior restored), and watch for any new issue your fix might cause, ensuring the regression is genuinely fixed without introducing another, the verification that a regression fix especially needs since you're changing code that's already proven able to regress.

How do I prevent regressions in my game?

Test changed areas before release, monitor per version after release to catch regressions fast, gate releases on stability, and verify fixes per version, you can't eliminate regression risk, but you can catch regressions before or right after they ship. Regressions come from changes breaking things that worked, and since you must keep changing your game, you can't eliminate the risk, but you can catch regressions early to limit their damage. First, test changed areas before release: when you make a change, test not just that it works but that it doesn't break related functionality (the areas the change touches), especially on real devices where regressions hide on your dev machine, catching regressions before they ship. Second, monitor per version after release: track crashes and stability per version, so a regression that slipped through is caught within minutes of shipping (a crash spike or new crash on the new build) rather than from player reports days later, letting you roll back or fix before it spreads. This is the safety net for regressions testing missed. Third, gate releases on stability: before a release goes wide, compare its stability against the previous build (per-version crash rate), and don't ship (or do a staged rollout) if it's obviously worse, catching regressions before full release. Fourth, verify fixes per version: confirm each fix resolved its target without introducing a regression (fixes can regress things), catching fix-introduced regressions. Fifth, be mindful when changing code with known fragile areas or past regressions. So you prevent regressions by testing changed areas before release, monitoring per version after release (catching what testing missed), gating on stability, and verifying fixes, catching regressions before or right after they ship. Bugnet's per-version crash tracking with alerts is central, it catches a regression within minutes of shipping (the new build's crashes), lets you gate by comparing builds, and verifies fixes per version, so regressions are caught fast (limiting their reach) and your fixes don't silently regress things, turning regressions from damaging surprises into caught-and-reversed events, since you can't prevent every regression but you can catch them before they spread.

What to Do When You Discover a Regression

Quick answer: Find which version introduced the regression by comparing per-version data, identify the change responsible, roll back or fix that change, and verify per version that the regression is resolved without reintroducing it.

A regression, something that used to work now broken by a change, is frustrating because the game was fine before. Finding which release introduced it and what changed is the path to fixing it. Here is what to do when you discover a regression.

Find Which Version Introduced the Regression

A regression appeared at some point, so find when: compare per-version data to see which build the regression first shows up on. The version where the previously-working thing started failing is the release that introduced the regression, narrowing the cause to that release's changes.

Bugnet tracks crashes and issues per version, so you can see which build a regression first appears on. Identifying the version where the previously-working behavior started failing isolates the regression to that release, the difference between knowing which release introduced it (and can be examined or rolled back) and a vague sense that something broke.

Identify the Change Responsible

Narrow to the change: with the introducing version identified, look at what changed in that release, the code, assets, or dependencies, that could have caused the regression. The captured stack trace (for a crash regression) points at where it breaks, helping you connect it to the specific change responsible.

Bugnet's captured context (stack trace, conditions) for the regression points at where it breaks, so you can connect it to what changed in the introducing release. Knowing the version and where it breaks helps you identify the specific change responsible, turning the regression from broke somewhere into this change in this release caused it.

Roll Back or Fix the Change and Verify

Reverse the regression: roll back the introducing release (or the specific change) if it's serious and a fix will take time, or fix the change responsible. Then verify per version that the regression is resolved, and that you didn't reintroduce the issue or cause a new one, the previously-working behavior working again.

Bugnet tracks per version, so after rolling back or fixing you can confirm the regression is resolved on the new build, and watch for any new issue. This verifies the fix, the regression gone, the previously-working behavior restored, without a new problem, in the field data, rather than assuming the fix to a regression didn't itself regress something.

When you discover a regression, find which version introduced it via per-version comparison, identify the change responsible, roll back or fix that change, and verify per version it's resolved without reintroducing it. A regression is something a release broke.