Space Flights is boring.
Once you get away from anything big it's void, empty and featureless.
TetrisMFD implements a simple tetris game in an MFD, which should help you shorten your Earth-Pluto trip.
Controls:
Shift+
A - left
D - right
S - drop
W - turn
Q - start new game
Game is real-time, independent of time accel.
Update 20070329:
Game pause added
DRP button modified