Here are some websites for you to explore if you would like to do more maths activities:
Simon Singh Parallel Mathematics https://parallel.org.uk/
Nrich https://nrich.maths.org/
Puzzles like sudoku etc https://www.puzzlemix.com/
UK Maths Challenge: https://www.ukmt.org.uk/
Art of Problem solving (Maths challenge questions): https://artofproblemsolving.com/
Cryptography competition: https://www.maths.manchester.ac.uk/cryptography_competition/
Puzzle of the week: https://www.puzzleoftheweek.com/puzzle-library