There are many sites on the Internet that claim to allow you to access websites that are not available in normal surfing areas. These sites are usually based overseas, and they are happy to sell their "services" to anyone who will pay the price. Although there is no clear-cut answer to the question, is accessing dark web links illegal in Singapore, there are some laws that prevent us from doing something that would constitute copyright infringement. If the site is offering something like software, you should buy it first and read the fine print