Mini Orb: An Intimidating Sudoku that Ends Up Being Highly Approachable

Today's Puzzle:

Don't do what I did and avoid for a few days, give it a go, it's a delightful little puzzle!

Link to Play Along:

Mini Orb by DiMono http://tinyurl.com/SudokuSleuthMiniOrb

Rules:

This grid has five overlapping 4x4 sudoku grids and four 3x3 latin squares.

Each 4x4 sudoku grid must include the digits 1234 once each in every row, column, and box.

Each 3x3 latin square must include a DIFFERENT set of three of those digits once each in every row and column.

Digits along an arrow must sum to the digit in the attached circle.