Singapore's political parties have officially started campaigning for general elections in which the ruling People's Action Party (PAP) faces contests in all available seats for the first time in the island-nation's history.

Campaigning will end on Sept. 9, two days before the election on Sept. 11, where political parties will vie for 89 seats. While official campaigning starts Tuesday, most parties have already introduced their candidates through press conferences, heartfelt videos and even savvy mobile applications.

Prime Minister Lee Hsien Loong, who is secretary-general of the PAP, urged voters to give his party, in power for the last 50 years, a "fresh and strong mandate" in setting the direction for the next 50 years.