Links: blog post (explanation) · itch.io page · marketplace page · documentation Platforms: All Versions: GMS1, GMS2 Price: $4.95 (itch), $6.99 (MP) QS is an extension that corrects a number of issues with the current implementation of data structures in GameMaker: Makes ds-related error messages more descriptive (e.g. if you are accessing a data structure that's already destroyed, you are told where it was destroyed from) Shows errors/warnings in situations where GM fails silently or does undesirable actions (e.g. when mixing up data structure types) Offers tools for figuring out memory leaks easier (you can view a list of currently active data structures per type and their origin of creation) Offers tools for figuring out issues with JSON easier (e.g. circular references or forgetting to mark something for JSON) Offers chained accessor functions Can seamlessly revert to using built-in functions for zero overhead. (if you value both your sanity and performance) All in all, it is designed as a definitive improvement as far as data structures go.