Pretty sure an expert hand tiler would be able to find this. Please post a spoiler only if you hand tile it...
Tile a $60\times60$ square with $1:2$ rectangles of sizes
No gaps/overlaps of course. Solution is unique, ie there is only one way to tile a $60\times60$ with all-different integer-sided $1:2$ rectangles, and only one way to fit them together, rotations & reflections aside. Sizes
2,3,4 means $2\times4$, $3\times6$, $4\times8$ etc.