JS1k: The JavaScript code golfing competition

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

with (a) {
            //collision checking, enemy/powerup creating and color setting
            Z = function (q, j, k, d, e, f, g, h) {
                //smaller than q != undefined
                if (q != Q.a) return j ? e + g > q & q + k > e & f + h > j & j + d > f : fillStyle = q;
                else t = this, t.X = r() * size, t.Y = r() * 4e3, t.A = r() - .5, t.s = t.z = t.H = 0;
            }
            blockx = [blocksize = [enemies = [powerups = [y = 3920]]]], x = xspeed = yspeed = press = key = xaccel = D = S = J = F = B = I = T = jump = 0, r = (m = Math).random, c.height = size = c.width;

            for (i = 0; i < 9; i++)
                blockx[i] = r() * size / 2 + size / 8,
                blocksize[i] = r() * 50 + 50,
                enemies[i] = new Z,
                powerups[i] = new Z;

            onkeydown = onkeyup = function (e) {
                which = e.which - 38;

                press != e.type[5] || key != which && !jump ?
                   (jump = !which, press = jump ? press : e.type[5], key = jump ? key : F ? -which : which, !jump ? xaccel = 0 : 0) : jump = 0;
            }
            M = function () {
                //if jump is set and the player is not in the air (yspeed is set) set yspeed to -2.5
                jump & !yspeed && (yspeed = J ? -4 : -2.5, jump = 0);
                y += (yspeed += speedinc = .05) > 3 ? yspeed = 3 : yspeed;

                !jump && press ? x += xspeed = key + (xaccel += key < 0 ? -speedinc : speedinc) : xspeed -= xspeed > 0 ? -speedinc : speedinc;

                T++;
                //clear screen
                Z(D ? 'hsla(' + (T % size) + ',99%,50%,.1)' : '#000');
                fillRect(0, 0, size, size);

                //draw blocks and enimies and check for collision
                Z('red');
                for (i = 1; i ^ 80; i++) {
                    if ((by = i * 50) < y + size && by > y - size) {
                        fillRect(bx = i ^ 79 ? blockx[i % 9] + ((!(i & i - 1)) || D ? m.sin(T / (y / 20)) * 20 : 0) : 0, by - y + size / 2, bs = i ^ 79 ? blocksize[i % 9] : size, 9) | Z(bx, by, bs, 9, x, y, 9, 20) && y + 17 < by && yspeed > 0 && (y = by - 20, yspeed = jump = 0);

                        for (f = 0; f < 9; f++) with (enemies[f]) H |= Z(bx, by, bs, 9, X, Y, 9, 9) && (Y = by - 9);
                    }
                }

                for (f = 0; f < 9; f++) {
                    Z('#30F');
                    with (enemies[f])
                        fillRect(X += A, Y > y + size ? Y = y - size : Y - y + size / 2, 9, 9),
                        X > size - 9 | X < 0 ? A = -A : 0,
                        H ? (s = !f || B ? -2.5 : 0, z = H = 0) : s < 3 ? s += speedinc : 0,
                        Z(X, Y += s, 9, 9, x, y, 9, 20) && !I && alert('Dysentery strikes again!') | _;

                    //draw player and powerups
                    Z(I ? "#F0F" : '#0f0');
                    fillRect(x, size / 2, 9, 20);
                    fillText('Score: ' + (-(y / 50 - 79) | 0), 0, 9);
                    with (powerups[f])
                        f < 6 && (!H && fillText(p = 'DSJFBI'[f], X, Y - y + size / 2),
                        Z(X, Y - 9, 9, 9, x, y, 9, 20) & !H && (this[p] = H = 1, setTimeout(p + '=0', 1e4)));

                }
                setTimeout(M, p.innerHTML = S ? 30 : 9);
            }
        } M();