Can rectangles overlap?
No. The grid must be perfectly tiled with non-overlapping rectangles.
What if a number is in a corner?
Corner numbers are highly constrained because the rectangle can only extend in two directions.
Are all Shikaku puzzles unique?
Well-designed Shikaku puzzles have a single valid tiling.
What is the smallest possible number?
1, which represents a 1x1 rectangle containing only that cell.
Do I need to know area formulas?
Just basic multiplication: a 2x3 rectangle has an area of 6.
