Dream Trigger 3D is one of those games that would have hugely benefitted from eShop presence, be it a demo or a smaller downloadable version, as while the concept in itself is difficult to grasp initially, the payoff in grasping a higher score and hearing the stage theme in its entirety is more than worth it. As far as effective 3D showcases and unique experiences on Nintendo's newest handheld go, you'll find fewer more so than this.
If it's a classic you're looking for, I don't know if this will completely fit the bill, but the feel is definitely there. If Dream Trigger didn't feel so awkward to play (and painful on the hands after a short while), it would have been graded higher. But as it stands, it's a nice, little distraction, and marks one of the first times that 3D on the system that doesn't feel tacked on.
In the end, Dream Trigger 3D will likely become a title with a niche following. The relatively high level of difficulty will likely turn off most players, especially since you experience it in the first level of the game. Once you finally understand how everything works, it becomes interesting. The game can feel a little long in the tooth considering that nothing new is introduced later, but at least the new backgrounds and themes keep things somewhat fresh. Considering how polarizing it is, the game is best recommended as a rental to see if you can deal with the high difficulty level and enjoy what's here or simply give up out of frustration.
Basically, Dream Trigger is a shooter that comes off like it was trying to reinvent shooters, but falls pretty flat. And that's probably not the kind of "trip" it was going for.
The big reason why this game received a two out of five, though, is because it crashed multiple times at random moments, forcing us to restart the system. Bottom line, we find this unacceptable.
Dream Trigger 3D is off-putting and inaccessible at worst when coupled with the difficulty level and crude production values. If this game had a more casually approachable tone and a greater focus on one core mechanic (or two simple and complementary ones), then there might have been a great game here. As it stands, it's a muddled nightmare, in 3D.