Any clues on this one? Having a very hard time completing it! Heck, all I can get filled in is the outside squares. Too many single spaces to be able to finish it! Phooey. :(

Have a look to the opposite one (3 stars...)

The inverse "brother" (Harth-warning inverse) was really helpful. Thanks.

Needed the inverse to solve this.

Very difficult to do and used the inverse to solve. The resulting image is fabulous.

Goddamn moron. You figure out making unsolvable puzzle and don't offer any real help.

Soooo, to do this one, it's best to do this guy's other puzzle, which is called "Harth-warming inverse", as noted above (you can search for it in the 'show search options' menu), then it's almost an identical copy (inverse) with the exception of a few spots.
A real hint for those still struggling is each corner is filled in. r1/c1,25 + r25/c1,25.
The base of the central flame is at r18/c11-15.
There are 2 other radiating lines around the central flame before you connect with r21 and the top corners.

Only with the inverse. Terrible.

Thank you for the tip with the reverse one! It is impossible otherwise to solve :(

Central flame: r8:c12; r9:c11,13; r10c16; r11c14-15,17; r13c10,16; r15c9,12; r17c10,11

The rest: r1c8,11,13,16,18; r2c10,14; r3c11,15; r4c7,17,20; r5c6,9,16,18,21; r6c8,10,19; r9c6,21; r22c2; r19c2; r15c23.

The remaining illogical few are curved outward from the 2 and 3 in r19.