Large Stopwatch - Use the Stopwatch in FULL SCREEN. Great for meetings, classrooms, conferences, schools, anywhere really... :-) Choose "stopwatch" mode to count up the hours, minutes and seconds as an activity progresses, or time a race between two classmates with this terrific Twinkl Classroom Stopwatch tool! Classroom Enhanced Visual Timer Choose "countdown" mode to count down the hours, minutes and seconds until the end of an activity, or time a race between two classmates with this terrific Twinkl Classroom Countdown Timer tool! Classroom Stopwatch Timer You may feel that you are good at crosswords and Sudoku, but the official Countdown App of Channel 4’s hit TV show is set to provide the ultimate mental challenge. Compete in all three Countdown disciplines: the letters round, the numbers round and the famous Countdown Conundrum.