How to Get Spazer Beam in Super Metroid
https://www.gamemite.com/guides/how-to-get-spazer-beam-in-super-metroid/
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https://www.youtube.com/watch?v=SpiNrom8e-o
This video shows where to find all 15 blue medallions in Resident Evil 4 (RE4) in order unlock the Punisher handgun. This secret handgun allows your shots to pierce through your targets and hit an enemy behind them, up to 5 enemies when fully upgraded. Shooting only 10 medallions unlocks the Punisher, but getting all 15 gets you a free upgrade in firepower on the gun when you talk to the merchant.
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https://www.youtube.com/watch?v=itdeMvQVGgI