They sure did love their coupons in the Ultraverse. One of the cooler sendaway deals was for Rune 0 (a copy of Solution 0 exclusive to this deal was also thrown in).
You needed 11 coupons (click on the pages below to read the instructions) although you could photocopy the coupons and there was a “wild coupon” in Ultra Monthly No. 4.
I also have a poster that might have come with this. I have to confess I did not send in any coupons; I picked up my copies on eBay a couple of years ago. They’re usually fairly cheap. You can check eBay just about any time and there will be 10 or so copies of Rune 0 along with six or seven copies of Solution 0 (I guess Rune was the bigger name).