#76 and 77: Shakashaka Squared

 made on 3/3/21; pictures added on 2/2/26

https://puzz.link/p?shakashaka/v:/10/10/.m2.oczzj..tcs.g

https://puzz.link/p?shakashaka/v:/10/10/zzv.q.zhbk./

Unshaded regions cannot be non-square rectangles. Only squares.