The PS Vita version of fighting game Skullgirls 2nd Encore was supposed to came out alongside the PS4 back in July. It never did.

We now know why as Lab Zero held an AMA on Reddit a couple of days ago and gave an update on the current state of the game's PS Vita version.

It was Lab Zero's designer Earl Gertwagen that explained what had happened.

"We had originally projected it would be ready to ship a few weeks after the PS4 version's release, but we ran into walls trying to bring optimization up to par, and grossly underestimated how much work that would require," Gertwagen said.

"This moved us into a timeframe where we had to start implementing features for the upcoming release of the Japanese version, which has further contributed to the delay."

Currently, Lab Zero is still optimizing Skullgirls 2nd Encore for PS Vita - an issue that has seen PS Vita ports cancelled before - and are still squashing bugs.

Hopefully it will arrive in the next few months but there's no guarantee.