Geometrical, few visual cues as to where you are. Constantly regenerating baddies give you something to shoot at if you have no net connection, but a plethora of invincibility powerups make them rather impotent. Don't fall in the water... you get transported to a room with no escape, and the only way out is to sucide under a crusher.

6 levels, sort of a wide range. Some seem to be designed for solo practice (FAR too many aliens for a reasonable net game), while others seem to be designed for net play. Flow ranges from constrictive to pretty darn good. Most are quite large... but that's not such a big deal on the solo practice levels. Worth a look.

Four levels, mostly small (well, except the last one). The first level is the only marathon level EVER to make me seasick. Be warned. Other levels: The Big Donut will make your eyes bleed, if you're not careful... lava everywhere.

A huge open waterfilled arena, with a funky cross in the center. So big that you get smearing under Infinity (although it plays fine under Aleph One). Ammo is a bit tight (would be okay for two or three, but the map is big enough for 5+). Some fun untextured wall tricks. Flow needs work.