Hi Banshee, thanks for playing.
If you want to give level 5 another shot, here's a gentle hint:
The secret is in the "memory" tile that you gained during the interlude. You can drag a tile to your memory to remember it, which will allow a tile to stick around when it should otherwise be blinked out of existence.
Or, here's the outright spoiler (paste this text into rot13.com to see)
Cynpr rnfg gvyr vagb zrzbel Tb qbja ynqqre Cynpr rnfg gvyr sebz zrzbel gb znxr oevqtr cneg 1 Cynpr rnfg gvyr sebz obneq gb znxr oevqtr cneg 2