number4d1 4D 4D 1.1. THE BASIC IDEA 4D is a simple game of chance. 1. Pick a 4-dit number from 0000 to 9999, e.g. 0138, 1012, 4318, 7766 or 9991. 2.*Winnings at S$1 Stakes **Winnings at S$1 Stakes. Though you can’t count on traditional multipliers when playing 4D in Singapore, it is still compensated by several