rychessmaster1 wrote:
This is SER without the 3/3 hole
No! All rules for the 3x3 hyper (yellow) layer are classical.
Of course, the central hole is not available for knights, unless the knight is a Chinese 傌 (馬).
Umbrella
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Metropolis or simply Umbrella is a Turtle (龜) variation with the parallel 3x3 net of wormholes.
The rules for the 3x3 hyper board are classical.
More:
https://www.chess.com/forum/view/chess960-chess-variants/turtle