Very fast, Hisoka's eyes on him immediately as he arrives, smiling to himself. So fast. Ah, he's so proud of you, Killua. It's almost a shame to see you as often now, he can't see how you've improved all at once after good chunks of time. Still, seeing this ever changing boy does him wonders, his fingers stiffen for a moment before he calms himself, cocking his head.

"Oh? That was fast." His eyes follow, eventually watching Killua's hands fondle and shuffle the cards. He leans back, securing his weight with his palm flat.

"A few, it'd better to ask you though, what do you know? I can't imagine much." Not yet anyway, he can't see Killua ever getting much time to learn any, and ontop of that- his lack of friends probably hinders his 'game knowledge' as well. But that's only a guess.