Tarantula Solitaire is an easier variant of Spider Solitaire.
It's easier in a relative sense given that Spider (with four suits) is a very difficult game to win. Easier as in it's easier to catch a tarantula than a black widow type of easier.
And how is it easier? Tarantula is easier (or maybe better put less difficult) as cards of the same colour may be dragged. This is in contrast to Spider where only cards of the same suit are draggable.
Tarantula Solitaire is, in my non-expert opinion, fiendishly difficult.
It is another one of the games that I haven't ever been able to win. I've come close but no cigar.