0 6 . ▁C annon ▁later ▁demonstrated ▁G G PO ▁to ▁Cap com , ▁which ▁was ▁posit ively ▁received . ▁ ▁The ▁download able ▁G G PO ▁client ▁supported ▁many ▁games ▁from ▁Cap com ▁and ▁SN K , ▁including ▁Super ▁Street ▁F ighter ▁II ▁Tur bo , ▁The ▁King ▁of ▁F igh ters ▁ 2 0 0 2 , ▁and ▁Metal ▁Sl ug ▁X ▁through ▁the ▁use ▁of ▁a ▁built - in ▁emulator . ▁Video ▁game ▁companies ▁have ▁also ▁implemented ▁a ▁lic ensed ▁version ▁of ▁G G PO . ▁Games ▁using ▁it ▁include ▁Sk ull g irls , ▁K iller ▁Inst inct ▁( 2 0 1 3 ), ▁and ▁Street ▁F ighter ▁III : ▁ 3 rd ▁St rike ▁Online ▁Edition . ▁ ▁On ▁October ▁ 9 th , ▁ 2 0 1 9 ▁C annon ▁announced ▁on ▁his ▁Twitter ▁account ▁that ▁G G PO ▁was ▁now ▁open ▁source ▁and ▁available ▁under ▁the ▁M IT ▁License . ▁ ▁Design ▁G G PO ▁uses ▁a ▁net code ▁technique ▁called ▁“ roll back ”. ▁R ather ▁than ▁waiting ▁for ▁input ▁to ▁be ▁received ▁from ▁other ▁players ▁before ▁sim ulating ▁the ▁next ▁frame , ▁G G PO ▁predict s ▁the ▁inputs ▁they ▁will ▁send ▁and ▁sim ul ates ▁the ▁next ▁frame ▁without ▁delay ▁using ▁that ▁assumption . ▁When ▁other ▁players ’ ▁inputs ▁arrive , ▁if ▁any ▁input ▁didn ’ t ▁match ▁the ▁prediction , ▁G G PO ▁roll s ▁back ▁the ▁state ▁of ▁the ▁game ▁to ▁the ▁last ▁correct ▁state , ▁then ▁re plays ▁all ▁players