Faces ...Tris III

[A Black Falcon]

Looking at the back of the box, they say it's the third game because Tetris was first, Welltris (aka Blockout, similar to Tetris 3-D on the VB) is second, and Faces (...Tris III) is third: https://www.mobygames.com/game/faces-tri...rId,47223/

It is still comically weird though, it'd be interesting to know what they were thinking...

It's apparently actually Alexi Pajitnov's fourth game, as Hatris is third, but Spectrum HoloByte didn't publish that one so they weren't counting it.