Period-18 glider gun

Period-18 glider gun
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Pattern type	Gun
Number of cells	849
Bounding box	81 × 50
Period	18
Barrels	1
Discovered by	400spartans Period1GliderGun David Raucci
Year of discovery	2025
Rules Outer-totalistic rules B3/S23 – B38/S237 # of rules 22 = 4 Isotropic rules B3/S23 – B38/S237
Pattern files Plaintext period18glidergun.cells RLE period18glidergun.rle

A period-18 glider gun is any glider gun which emits a period 18 glider stream. The first true-period 18 glider gun was discovered by 400spartans on March 25th, 2025, based on a partial by Period1GliderGun. The main sparker was reduced by Period1GliderGun as well as several other people over the next few days. It was reduced to its current form by jeremydover on February 21, 2026.

External links

• p18 gun at the Life Lexicon