Stars: one star per row, column and region

Goal

Place stars on the board so there is one in every row, one in every column and one in every colour region, with no two touching.

How to play

Place one star in every row, every column and every coloured region.
Two stars can never touch, not even diagonally.
Tap a square to mark it with a dot, again for a star, and once more to clear it.
Drag your finger to mark several squares with dots at once.
If a star breaks a rule (it shares a row, column or region with another, or touches one), it's marked in red.
"Undo" takes back a step and "Start over" (asks for confirmation) clears the board.

Key rules

Regions are told apart by colour and by a thick border.
The dot is just your own mark to remember ruled-out squares: it doesn't count as a star.
Every puzzle has exactly one solution.
There are no lives or maximum tries: you can't lose.
It's the same puzzle in every language.

Scoring and rewards

Daily puzzle: 14 loopies (each hint takes 2 off, minimum 6) + speed bonus (up to +4; reference: 15 seconds per row of the board).
Infinite mode: 10 loopies (each hint takes 2 off, minimum 4) + speed bonus (up to +2). Stars by hints: 0 → 3, 1-2 → 2, 3 or more → 1.
Every loopie also gives 1 XP.
Hint: removes a wrongly placed star (leaving a dot) or, if there are none, places a missing one (2 loopies; "Free hint" by watching an ad takes nothing off).

Modes and difficulty

a daily puzzle that grows through the week (Monday and Tuesday 6×6, Wednesday to Friday 7×7, Saturday and Sunday 8×8), infinite mode (from 5×5 to 9×9: levels 1-3 5×5; 4-8 6×6; 9-15 7×7; 16-25 8×8; from 26 9×9) and archive. Same in every language.

Tips

Start with the smallest regions: they have few possible squares for their star.
Every star rules out, with dots, the squares in its row, its column and the ones around it (diagonals included).
If a row, column or region has only one free square left, that's where the star goes.