Not many options to choose from there... and plenty of other candidates spring to mind (North Korea, Myanmar - previously Burma, Syria, Iran... to name but a very few).
What do you mean by strict?
Compared to places like Myanmar, Syria, etc. there is a heck of a lot of freedom for Singaporeans. Let's face it, rules about no chewing gum, no carrying durians on the metro and even public flogging for drug dealers seem kind of mild compared with (for example) indefinite house arrest and media silence for anyone who is pro democracy in Myanmar and disagrees with the military junta in power over there or being gunned down in the street for pro democracy demonstrations in Syria