Well, the classic maze game that appeared in 2003 is the best till date. However, one of the problems you can face while scaring people is that they have already been subjected to it before and are already prepared for what is going to happen next. Therefore, if somebody is actually living under the rock, you can play the classic maze prank. If not, then you can try numerous variations that are available on the intent and scare your friends then.
The best thing is that these games can be played online, you can send the link to some friend and you can also download the game to your PC. Therefore, there is not a single chance that your friends are getting away with the prank. They have to be the victims. Moreover, always make sure that there is something that helps you in putting your honest and harmless intentions while playing the prank. It is quite obvious that some people might get offended and they might even hate the fact that you played this prank on them. It is also distasteful of you to play a prank, make a video and circulate it amongst your friends and even strangers on the internet. If the person is sensitive enough, then chances are high that they would be deeply hurt and might do something that they must not.
Therefore, you are advised to play a prank, but only in good humor. This would help you in getting more of what you want and would also not be considered bad. If you laugh with them, then they would also start laughing with you and the moment will pass. Do not make an issue of this situation or stretch it too far. That way, you will be hurting their self respect and would also be hurting your relationship.
Have fun, get entertained and keep scaring people. The scary maze game was built to give you some harmless fun. Therefore, download as many versions as you can and entertain yourself and your friends.