Mystery Square

It's a puzzle I created over a decade ago, and I have decided to introduce it to you. It is called “Mystery Square”. It is made up of four different symbols, each with its own value. The numbers on the sides of the grid indicate the sum of the symbols in the corresponding row or column. It is up to you to deduce the value of each symbol. Only one solution is possible. The first two puzzles are easy, the next one is medium and the last one requires a little bit more effort.  

1)

Puzzle :alge_1_00077.pdf

Solution :alge_1_00077_sol.pdf

2)

Puzzle :alge_1_18466.pdf

Solution :alge_1_18466_sol.pdf

3)

Puzzle :alge_2_18854.pdf

Solution :alge_2_18854_sol.pdf

4)

Puzzle :alge_3_26327.pdf

Solution :alge_3_26327_sol.pdf

Have fun!.