System Entry, iBet\n\n Select four digits and place bets on all its possible combinations. For System Entry, each 4D number combination costs a minimum of $1. For iBet, all 4D number combinations cost a minimum of $1 in total. Your prize money is proportionately divided by the number of combinations.

Some bettors will assign 1 percent of their bankroll to a unit, while others could do 2, 3 or even 5 percent. If you have a bankroll of $1,000, for example, 1 unit could be $10 or maybe $20 or even $30. If you have a bankroll of $2,000, 1 unit could be $20 or maybe even $40 or $100.