Most foreigners coming into Singapore do not require visas for entry and may be given social visit passes for up to 30 days upon their arrival in Singapore. However, it is best to consult your local consular office for the latest information with regards to coming into Singapore.
If you would like to stay in Singapore for a longer period, you may apply to the Immigration & Checkpoints Authority (ICA) upon your arrival. You should have a valid passport with at least 6 months validity, onward or return tickets, onward facilities (such as visas or entry permits) to your next destination, and of course, sufficient funds for your stay in Singapore. You may also visit Singapore Immigration & Checkpoint Authority website for more details