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It's hard to pick a fav, but I think it would be the Vertical Laser seed.

It splits the area with an "invisible wall" into two sections with the plot acting as a bridge between them. Not always the most useful, but it's fun and it costs nothing so if things don't work out (and you don't hit yourself in the face) no biggie.

Wow I love to see it! It's been a seed type we've been changing forever because we were never super happy with it so I love to see that it's your favorite!