2 added 12 characters in body
source | link

SmileBASIC

?@H[1]+@e[!0];CHR$(108);"lo world!

This (and other slight variations) might be the onlyAnother solution.:

CLS?"He__o world!
LOCATE 2,0?@l[1]*2

SmileBASIC

?@H[1]+@e[!0];CHR$(108);"lo world!

This (and other slight variations) might be the only solution.

SmileBASIC

?@H[1]+@e[!0];CHR$(108);"lo world!

Another solution:

CLS?"He__o world!
LOCATE 2,0?@l[1]*2
1
source | link

SmileBASIC

?@H[1]+@e[!0];CHR$(108);"lo world!

This (and other slight variations) might be the only solution.