Mark Sweep's puzzles

These puzzles were made for a speed setting contest on the CTC Discord server. The assignment was quite simple: create 3 puzzles from 3 out of 5 listed genres, in a time period of 75 minutes. To challenge myself, I tried to share elements between the puzzles (the givens and the regions). Due to time pressure near the end I had to use an online solver to make sure the Nurikabe would be unique with the same numbers as the Double Choco, which actually caused the Nurikabe to be very hard to solve logically. Hence, I spent some time since then to find a more enjoyable Nurikabe, although this did make the Double Choco somewhat harder. Anyway, I have shared the old versions below as well if you're interested. Enjoy! Rules LITS Shade one tetromino of cells in each region so that all shaded cells form one orthogonally connected area. Two tetrominoes of the same shape may not share a bold border, counting rotations and reflections as the same. No 2x2 region may be entirely shaded. Double Cho...

This puzzle may not really have good aesthetics, but I am quite pleased with the logical flow of it. Rules Shade one tetromino of cells in each region so that all shaded cells form one orthogonally connected area. Two tetrominoes of the same shape may not share a bold border, counting rotations and reflections as the same. No 2x2 region may be entirely shaded. Solve online

The first hybrid on this blog. Shouldn't be too difficult once you understand the interactions between both genres. Rules Divide the grid into regions of orthogonally connected cells, each containing a connected group of white cells and a connected group of grey cells, with the property that the shape of the white cells is identical to the shape of the grey cells, allowing rotations and reflections. In each of these regions, one tetromino of cells is to be shaded so that all shaded cells form one orthogonally connected area. Two tetrominoes of the same shape may not share a region border, counting rotations and reflections as the same. No 2x2 region may be entirely shaded. Solve online The solve link has a second grid to solve the LITS on, if you wish.