redBlock.velocity.x = key_left + key_right;
    for(Block block: greenBlocks) {
        block.setPosition(block.getX() + block.velocity.x, block.getY() + block.velocity.y);
        block.setBounds(block.getX(), block.getY(), 64, 64);

        if(isColliding(new Rectangle(redBlock.getX(), redBlock.getY() - 1, 64, 64), block.getBoundingRectangle())) {
            redBlock.velocity.y = key_jump * 5;
        }

        //Vertical Collision
        if(isColliding(new Rectangle(redBlock.getX(), redBlock.getY() + redBlock.velocity.y, 64, 64), block.getBoundingRectangle())) {
            while(!isColliding(new Rectangle(redBlock.getX(), redBlock.getY() + sign(redBlock.velocity.y), 64, 64), block.getBoundingRectangle())) {
                redBlock.setPosition(redBlock.getX(), redBlock.getY() + sign(redBlock.velocity.y));
            }
            redBlock.velocity.y = block.velocity.y;
            redBlock.velocity.x = key_left + key_right + block.velocity.x;
            grounded = true;
        }

        //Horizontal Collision
        if(isColliding(new Rectangle(redBlock.getX() + redBlock.velocity.x, redBlock.getY(), 64, 64), block.getBoundingRectangle())) {
            while(!isColliding(new Rectangle(redBlock.getX() + sign(redBlock.velocity.x), redBlock.getY(), 64, 64), block.getBoundingRectangle())) {
                redBlock.setPosition(redBlock.getX() + sign(redBlock.velocity.x), redBlock.getY());
            }
            if(!grounded) {
                redBlock.velocity.x = block.velocity.x;
            }
        }
    }
    if(!grounded) {
        if (redBlock.velocity.y > -5)
            redBlock.velocity.y += redBlock.gravity;
    }
    grounded = false;

    redBlock.setPosition(redBlock.getX(), redBlock.getY() + redBlock.velocity.y);
    redBlock.setPosition(redBlock.getX() + redBlock.velocity.x, redBlock.getY());