Top 5 Z80 Coding Hacks

Here are my top 5 Z80 coding hacks, which I used recently when writing the Monitor for the TEC-1F (Mon3) and my LCD Frogger Game. Please share your own interesting Z80 coding snippets in the comments section below. And my Top 5 are: 00:00 Intro 00:30 Compare HL with DE 01:10 Inline Data 02:23 Hidden Instructions 03:34 XOR Magic Key 04:41 CPI for Iteration