Nuritwintwin rules modified from pzprxs:

Standard Nuritwin rules, except shade 4 blocks in every region instead of 2.

Shade some cells on the board. Each connected group of shaded cells within the same region is called a block. Every region has exactly 4 blocks, and the blocks must have the same size. A number indicates the size of each block inside that region. The shaded cells cannot form a 2x2 square. All shaded cells form an orthogonally contiguous area.

Theme: 1235 (the server I made this for has an emote that's 🔢 except edited so the 4 is a 5)

Nuritwintwin puzzle

Interactive solver at Puzzle Square JP