You may see searches for "Ricochet Xtreme Activation Code 20" or "serial key." It is important to be cautious. In the modern era, many websites claiming to host "keygens" or "cracks" for old games are often fronts for malware.
Since Reflexive Arcade was acquired by Amazon years ago, official support for old activation codes can be limited. However, the community has kept the game alive: Ricochet Xtreme Activation Code 20