TETR.IO but it's underwater

[@PetrTech]

Custom CSS:
canvas{ filter: blur(8px); animation-name: funny; animation-iteration-count: infinite; animation-duration: 20s; }
#cutins::before{ content: ''; position: fixed; left: 0; right: 0; top: 0; bottom: 0; background: #175261; opacity: 0.4; }
@keyframes funny{ from{ transform: skew(-3deg) } 50%{ transform: skew(3deg) } to{ transform: skew(-3deg) } }