The correct option is option A (makes). This is so because singular nouns just like 'snakes and ladders'  are always followed by a singular verb and  'makes' is a singular verb. Recall one of the rules of concords says that, if the subject is singular, the verb should be singular and if the subject is plural, the verb should also be plural.

To better understand this, 'snakes and ladders' as used in this context refers to a game and not independent words. Hence, it will be followed by a singular verb. 

 A singular verb is a word that shows or explains what the subject has done, or what is being done, or what will be done. It is always used with a singular subject in a sentence.

In this regards, 'makes' explains what 'snakes and ladders' as a game does to the speaker.

Note that adverbs do not change the verb tense