Challenges and collections created by Tim

• googlequiz

  A challenge by tim.
  It is worth 3 points. 12 users have taken it.
• some challenges we discussed today

  June 5th

  A collection of challenges selected by tim.
• London Challenge

  A challenge by tim.
  It is worth 3 points. 5 users have taken it.
• This is a very boring test collection - sorry!

  Tim’s test collection

  A collection of challenges selected by tim.