Today I paid my bills, considered the pros and cons of renting a nicer apartment, opened a bank account that seemed vaguely exploitative, feared that I was in danger of spending beyond my means and made a squirrel wear hob-nailed boots so that it could kick its athletic opponents in the back of the knee. Then I wondered if squirrels have knees. I’ve actually done all of those things, except the bits about squirrels. UNTIL NOW. International Racing Squirrels, a free browser game developed by Playniac for Britain’s own Channel 4, aims to teach youngsters about financial responsibility and running small businesses. Does it work?