Dino Dens

About Dino Dens

Place one egg in every row, column and coloured den, with no two eggs touching — three grids against the clock.

Dino Dens is a placement logic puzzle in the Star Battle family. The grid is split into coloured dens, as many dens as the grid has rows. Place an egg so that every row, every column and every den holds exactly one, and no two eggs touch — not side by side, and not corner to corner either.

Every grid is made by our server to have exactly one answer, so it can always be solved by reasoning alone: a small den that fits in one row claims that row, and two dens that share the same two columns claim both of them. Tap a square once to cross it out, twice to place an egg. A round is three grids, six, seven and eight squares across; your time for all three, measured by our server, goes on the monthly leaderboard, which resets on the 1st of every month at 00:00 UTC.

How to play

1. Press Start. The first grid appears with its coloured dens, and the clock starts.
2. Tap a square once to cross it out: a note to yourself that no egg can go there. Drag to cross out several at once.
3. Tap a crossed-out square to place an egg there, and tap an egg to clear the square again.
4. Every row, every column and every den needs exactly one egg, and no two eggs may touch, even at a corner. Eggs that break a rule turn red.
5. Place the last egg correctly and the next, bigger grid appears. Complete all three to finish.
6. Sign in to put your time on the monthly board.

Tips

• Start with the smallest dens: a den of one or two squares leaves its egg almost nowhere else to go.
• An egg rules out its whole row and column, its whole den and the eight squares around it. Cross them all out straight away.
• If a den lies entirely inside one row, that row's egg belongs to that den: cross out the rest of the row.
• Count dens and lines: when two dens fit inside the same two columns, those columns' eggs belong to them, and every other den must stay out.
• If an egg in one square would cross out every square of some den, that square cannot hold an egg.

Questions players ask