To diagnose Use-After-Free (UAF) and heap corruption bugs in complex C++ game codebases:

1. Enable Pageheap in GFlags (gflags.exe /p /enable target_game.exe /full).
2. Pageheap places an inaccessible guard page (PAGE_NOACCESS) immediately following every dynamic allocation.
3. Attach WinDbg.
4. When a dangling pointer reads freed memory or overflows a buffer by even 1 byte, the CPU triggers an immediate page fault and WinDbg breaks on the exact offending instruction!

Pageheap is an absolute lifesaver for catching memory corruption bugs before shipping code.

Requires significant RAM but pinpointing UAF bugs in 5 seconds is worth it.