Not sure about the right finish to tetris. After doing tetris I went back and tried this finish, but the top was very damp so I just shuffled to the right arete and dropped off rather than manteling out the slab. For me it felt easier than tetris (ie, 7c/V9 ish), as you avoid the cut loose swinging round the corner. Certainly it's stacks easier than the inertia reel trav (low V12/8a+, perhaps even just 8a).
I know that Andi Turner did Tetris shortly after me, but don't know whether he did the RH finish. There is rumour of all these lines being done before, but no confirmation, which is why I didn't put FAs next to any of them.
THe cottage rocks ones may be new though.