Try this puzzle. It involves mathematical operations. Created on my own.
CSV (for those who aren't able to see images):
Key:
+--+----------+
|o |orange |
|g |green |
|lb|light blue|
|b |blue |
|r |red |
+--+----------+
+---+---+---+---+---+---+---+---+---+---+
|o 4|b 7|g 5|r 3|g 2|b 5|r 3|r 5|lb1|o 7|208
+---+---+---+---+---+---+---+---+---+---+
|o 8|r 8|r 2|o 4|b 9|g 4|lb8|r 9|b 3|r 9|308
+---+---+---+---+---+---+---+---+---+---+
|o 9|o 4|g 6|b 6|o 7|lb6|g 4|lb5|r 2|o 9|367
+---+---+---+---+---+---+---+---+---+---+
|lb4|b 4|g 2|r 9|r 3|o 7|b 3|g 8|b 2|g 3| ?
+---+---+---+---+---+---+---+---+---+---+
|r 1|o 8|lb8|r 3|b 2|r 5|g 4|b 6|g 7|lb2|239
+---+---+---+---+---+---+---+---+---+---+
|o 9|b 8|r 9|g 3|lb2|o 4|b 9|g 3|lb3|r 7|293
+---+---+---+---+---+---+---+---+---+---+
|o 4|g 5|r 5|lb4|lb7|b 2|g 6|o 7|o 4|r 6|282
+---+---+---+---+---+---+---+---+---+---+
|r 1|b 8|lb4|o 1|g 1|r 9|o 2|r 8|lb4|lb7|180
+---+---+---+---+---+---+---+---+---+---+
|o 3|r 2|r 8|lb1|g 8|lb4|lb2|g 0|o 9|b 6|243
+---+---+---+---+---+---+---+---+---+---+
316 279 223 157 216 230 204 266 205 288
