Extra lives:
Jump across the first pond at the first part of level 1-3 and hit a pole. Hold Left as the pole propels your character upwards back on the pole again. Each time your character is sent upwards, one extra life is collected. Repeat this process until ten extra lives have been collected, then locate the next pond. Repeat this trick again to collect more extra lives. Note: Collecting more than 255 extra lives will reset the counter to zero.