There are many recommendations for Nrich games on the pages of this site.
Some of the games chosen by Nrich
Note this selection of Games chosen by Nrich themselves, Secondary Interactive Resources which have been chosen for use in the computer room or on the whiteboard. The games are presented in order of difficulty; we have Countdown for example, but with Complex Numbers, Vectors and Matrices.
The Black Box Game requires some thinking outside the box!
Select Image for Transum’s Pu Wiange puzzle
I couldn’t resist this counter moving challenge – happy to report that I scored 20! Evidence in the image!
Update: 19 is the new record!
You can try more puzzles from Transum here.
There are plenty to try, all are attractively presented and easy to use. Fun to do but these puzzles will help students practise a variety of mathematical skills.
Some of these puzzles would make good lesson starters, for example the Magic Square puzzle or Prime Square.
Note – this has been added to the Puzzles page.
From Coolmath games – a logic game to keep you busy! Can you light up the Christmas tree?
From Coolmath Games – light up the tree!
From Shane Hill, the creator of World Maths Day comes Core Skills for 4 to 10 year olds. This can be played on a PC or tablet and is free all year round.
Find the Factors Puzzles – Iva Sallay
For a puzzle with a difference which requires both logic and multiplication try a Find the Factors puzzle from Iva Sallay on her Find the Factors blog. In this Find the Factors 1-10 puzzle can you place the numbers 1 to 10 in the first row and the first column to make the multiplication table work? Iva Sallay has clearly explained the puzzles here: How to Find the Factors.
New puzzles are published each week, I like the Excel files provided with puzzles of varying levels of difficulty. You will also find many hints and tips in the various posts. See Hooked on Factoring, for example, a post giving techniques for solving the puzzles and an Excel file of puzzles.
Think Outside the Flock – Bart Bonte
I really like Bart Bonte’s logic game ‘Think Outside the Flock’. The game is on Math Playground which I know has many games students enjoy; I have added a new Logic page which includes this and other logic games and puzzles.