A weekend with all three
You do not need a plan. Open one game, finish a Beginner board, or leave it and Continue.
If you want a second kind of board, switch. Sudoku is the large digit grid. Killer Sudoku is the same grid with cages. Star Battle is stars and space. Binary Puzzle is 0s and 1s.
A weekend can be three short sits or one long one. Time is private. Nothing on the site counts your days. Come back when you want.
Solved shows what you finished in this browser. That is enough of a record. Home, Play, and the how-tos — Sudoku, Star Battle, Binary Puzzle, Killer Sudoku — are the whole site.