If you get stuck while solving this puzzle, you're more than welcome to try asking the Magic 8-Box for advice. Don't get your hopes up, mind - it's even less forthcoming than its namesake, in that it's only able to give the answer "5"...
The trick that kicks the intended solution off is... well, tricky, I guess, but hopefully not diabolical. You'll know it when you see it.. or, rather, you'll know it when you see the very next step after it! Still, as always, I hope you enjoy the puzzle if you take a stab at it, and though I'm not necessarily great at responding to comments I absolutely do read them, so feel free to leave one if you fancy doing so. Good luck, and happy solving!
Normal sudoku rules apply.
Digits along an arrow must sum to the value in its circle; these digits can repeat, when permitted by normal sudoku.
The digits in Box 8, which has been highlighted in magical magenta, must form a 3x3 magic square.
Solve on f-puzzles here!