https://www.siliconera.com/a-rundown-of-ninja-gaiden-sigma-plus-features/
A Rundown Of Ninja Gaiden Sigma Plus Features - Siliconera
Jan 26, 2012 - A new trailer shows Vita-specific features like using the touch screen for ninpo and motion-controlled archery.
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https://www.pushsquare.com/news/2013/01/ninja_gaiden_sigma_plus_strikes_north_american_ps_plus
Ninja Gaiden Sigma Plus Strikes North American PS Plus | Push Square
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https://www.engadget.com/2012-09-19-team-ninja-reveals-ninja-gaiden-sigma-2-plus-headed-to-ps-vita.html
Team Ninja reveals Ninja Gaiden Sigma 2 Plus headed to PS Vita
Sep 19, 2012 - At a private event in Tokyo, Team Ninja head Yosuke Hayashi announced that Ninja Gaiden Sigma 2 Plus will be coming to PlayStation Vita in early 2013. Hayashi...
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