Heartburst. Heartburst is a 5-reel, line online slot game with bonus spins, instant play, autoplay, video slots, multiplier, wild symbol, scatter symbol. Heartburst. Play for free the Heartburst slot machine from Eyecon software or choose the best online casinos with Heartburst available in your country. The games at the site are powered by Random Logic. Legacy of the Wild 2. Heartburst is a five reel slot with four rows and up to one hundred paylines; the design is simple but pleasing to the eye with those bright. Play for free the Heartburst slot machine from Eyecon software or choose the best online casinos with Heartburst available in your country. Originally launched in , Casino has come a long way when it comes to providing online casino games. Heartburst is a five reel slot with four rows and up to one hundred paylines; the design is simple but pleasing to the eye with those bright. . Legacy of the Wild 2.