Hey Sigs! Did you see that power cable?
Yes, shut up.
maybe you can plug it into something that needs power to power it did you think of that maybe?
Shut up shut up shut up shut up shut up shut up shut up.
And so on. This isn't just an issue of the characters in the game not giving you a chance to answer (which they don't ever), Sigma really is too thick to see what the player may see quite clearly, as well as completely ignorant of any reference to science or literature that may come up to the point that he's never heard of Schrödinger's cat.
The real head scratcher in all of this is that the first game in the series, 999: Nine Hours Nine Persons Nine Doors, didn't suffer from this problem at all. Not only was the protagonist of the first game, Junpei, pretty sharp, many of the tricky or knowledge-based questions posed to Junpei are answered by the player. Characters ask Junpei to piece together evidence, ascertain the meaning of a cryptic image, confirm or deny knowledge of various concepts and much more, and in most cases it's the player who gets to answer. While I didn't appreciate this at the time for what it was, the many non-critical choices made available to the player had the invaluable effect of maintaining a strong connection between Junpei, the character, and Junpei, the player avatar. This made the events of the first game feel more intimate merely by virtue of the fact that Junpei wasn't ignorant of what you knew.
That aside, the game deserves a purchase. Not only is the story still compelling, excellent voice work adds some emotive depth, and the logically designed puzzles are satisfying to figure out on your own. Sigma may gradually wear away at your nerves, but in the short time I've been enjoying the game (only completing one path and a little of another), I've never once missed my $30.