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And here is a concise JavaScript tetris (playable: http://copy.sh/tetris/): f=[];p=[1];g=h=2;s=0;t=500;for(i=0;23>i;i++)f[i]=j=-16380;f[23]=-1;onkeydown=e;e(e);function e(b,a){(k=b.which)?k-38?k&-3^37||(g+=a=k^37?-1:1):(z=p,v=p[2],c=p[1],p=[2*v&2|4*c&4,p[3]/2&1|v&2|2*c&4|4*p[0]&8,p[3]/4&1|v/2&2|c&4|2*p[0]&8,v/4&2|c/2&4]):s-j&&setTimeout(e,100+t,h++);m=p[0]<<g;l=p[1]<<g;_=p[2]<<g;o=p[3]<<g;f[h+=32==k]&m|f[1+h]&l|f[2+h]&_|f[3+h]&o?a?g-=a:k^38?(f[h]|=l,f[--h]|=m,f[2+h]|=_,f[3+h]|=o,h?(g=6,x=new Date%7*4,p=[h=0,2908739>>x&15,266758006>>x&15],t*=.97):s+=" Game Over!"):p=z:k^32||e(b);for(y=_=o="";24>++y;o+="\n")for(f[y]+4||(f.splice(y,1),f.unshift(j),s+=++_,o="",y=2),x=14;x;q.textContent=o+s)o+=" X"[(f[y]|p[y-h]<<g)>>x--&1]}
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I can walk through the submitter's code and understand what's happening clearly. It's fairly well structured and easy enough to read. This is 20x more valuable than any code that is produced using uncommented edge features for a perceived 5% gain. (Note that I'm making up these numbers to illustrate a point.)