Your rooks glide any distance up and down a file, but can only shuffle one square at a time sideways along a rank.
Columnar Rooksis one of Nerf Chess's secret handicaps. In Nerf mode you choose one of two nerfs before the first move, in secret, and carry it for the whole game.
The board quietly enforces it: any move it forbids is simply never offered, so you cannot break it by accident. Your opponent never sees which nerf you took until the game ends, so every move you make is also a clue they are trying to read.
“The towers ride the elevator; sideways, they only inch.”