IGN: "Dream Trigger 3D isn't your average shooter. For starters, your enemies are invisible. To unveil them you have to drop sonar pings using the touch screen. Once the enemies appear you can swoop in and "fire" at them, which means ramming your butterfly/reticule/whatever at the enemies while holding the left shoulder button.
It takes a few tries to figure out. Dream Trigger 3D's unhelpful tutorial and unique design give it a steep initial learning curve. But once you "get it" it's easy to get into the flow of the game. When you're in the zone each level in Dream Trigger 3D becomes one continuous movement. It's a fun, non-traditional approach to shooters."