Why do regressions happen in code I didn't change?

Because changes ripple through shared dependencies. A fix or feature in one system often touches code, data, or state that other systems rely on, so a function you modified for one purpose can quietly break a feature elsewhere that called it, or a change in shared state can invalidate an assumption another system made. This is exactly why regression testing covers core flows broadly rather than just the area you edited, and why testing the ripple areas a change could affect matters, the regression is usually not in your change itself but in something downstream of it that you didn't think to check. Games are especially prone because systems are interconnected, shared managers, global state, common utilities, so a change's effects spread further than intended. The practical implication is that you can't assume a change is isolated just because you intended it to be; you have to verify the features that could be affected still work, which is what regression testing does. Per-version crash tracking is also valuable here: when a regression does slip into untouched-seeming code, it spikes on the new build, so you catch it quickly even if you didn't anticipate which feature the change would break.

How can a small team keep up with regression testing?

Make it fast and partly automatic so it actually happens every release. A short manual checklist of must-work core flows takes only minutes per release and catches the blunt, game-breaking regressions that cause the worst fires, so that alone is high return for low effort and sustainable even for a tiny team. Automating tests on your most critical logic provides a regression safety net that runs every build without anyone remembering to, far more reliable than ad-hoc manual testing under deadline pressure, and the upfront cost pays off as the checks run forever. Tracking crashes per version catches whatever slips through both, since a regression that escapes your checklist and automation shows up as a crash spike on the new build, giving you a backstop without additional testing effort. The combination, a quick manual checklist, automated tests on critical logic, and per-version crash monitoring, gives small-team regression coverage that approximates what a QA department provides, without the headcount. The key is keeping the manual part short enough to run every time (so it's not skipped) and automating the repetitive part (so coverage doesn't depend on remembering), which makes consistent regression testing achievable even with very limited resources.

Best Practices for Regression Testing

Q: What are the best practices for regression testing?

Keep a checklist of the core flows that must always work, the game boots, saves load, the core loop completes, purchases work, and run it before every release, since this catches the catastrophic regressions in a few minutes and is the highest-return regression practice. Automate what you can so regression checks on core logic run every build without manual effort, since manual regression testing gets skipped under pressure. Test the areas your change could ripple into, not just what you changed, since regressions hide in code you didn't mean to touch, the shared systems a change quietly affects. And track crashes per version as a safety net so a regression that escapes testing surfaces fast as the new build crashing more than the last. Together these catch the working features that changes quietly break, on both sides of shipping, the checklist and automation and ripple-testing before release, and per-version tracking after, which is what keeps updates from silently degrading your game.

Quick answer: Keep a checklist of must-work core flows and run it every release, automate what you can, test the ripple areas, and track crashes per version. Good regression testing catches what changes quietly break.

Regression testing, making sure changes don't break things that worked, is one of the most valuable and most skipped QA practices. Here are the best practices for regression testing.

Keep a Checklist of Core Flows That Must Always Work

The foundation is a checklist of the core flows that must always work, the game boots, saves load, the core loop completes, purchases work, run before every release. This catches the catastrophic regressions, the ones that turn an update into a disaster, in a few minutes, which is the highest-return regression practice.

Bugnet tracks crashes per version, so a regression that slips past your checklist surfaces fast. A consistent core-flow checklist is the cheapest, highest-return regression practice, reliably catching the blunt, game-breaking regressions that cause the worst launch-day fires.

Automate What You Can and Test the Ripple Areas

Manual regression testing gets skipped, so automate what you can, automated tests catch regressions every build without manual effort. And test the areas your change could ripple into, not just what you changed, since regressions hide in code you didn't mean to touch, the shared systems a change quietly affects.

Bugnet's per-version tracking backs up automated tests and ripple-area testing. Automating regression checks and testing the ripple areas catch regressions before they ship, the former sustainably every build, the latter where regressions actually hide.

Track Crashes Per Version to Catch What Slips Through

No regression testing catches everything, so track crashes per version as a safety net, a regression that escapes testing surfaces as the new build crashing more than the last. Per-version tracking catches the regressions your testing missed, fast, before they spread to most players.

Bugnet tracks crash rate per version and alerts on spikes, so escaped regressions surface fast. So practice regression testing with a core-flow checklist, automation and ripple-area testing, and per-version crash tracking, catching the working features that changes quietly break, before and after release.

Keep a checklist of must-work core flows and run it every release, automate what you can, test the ripple areas, and track crashes per version. Good regression testing catches what changes quietly break.