Euler-Eulerian Arithmetic

Euler is an arithmetic puzzle game. You have to figure out the value for each symbol based on the totals and clues given. Each column adds up to the number at the bottom, each row adds up to the number on the right, and the diagonal row adds up to the number in the bottom right corner. Are your arithmetic skills good enough?
Tap a difficulty to get started. Tap a symbol and assign it a number. Make sure they add up to the totals for the rows, columns, and diagonal. Start with the clues first!