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Cross the Streams (230)
Instruction:
Shade some empty cells black. All black cells connect along edges to create a single connected region. (It is permissible for the region to touch itself at a corner, but touching at a corner does not connect the region.) No 2×2 group of squares can be entirely shaded black.
The numbers to the left of (and above) the main grid represent the lengths of contiguous blackened cell blocks in the corresponding row (or column). The lengths are given in order from left to right (or top to bottom), and cell blocks must contain at least one unblackened cell between them. Some numbers have been replaced with the "?" (question mark) symbol, one symbol per number. Then, groups of "?" symbols have been replaced with the "*" (asterisk) symbol; each "*" might represent multiple "?" symbols, one "?" symbol, or no "?" symbols at all.