the best option is: to take 45 bus from sauletekis to PRAMOGU ARENA.
then cross the road and go to another "pramogu arena" stop. and then take 34 bus. (leave the bus at RUGIU stop) next to laser arena ;)
http://www.marsrutai.lt/vilnius/en/#Search/Saul%C4%97tekis,Rugi%C5%B3%20st.,2012-04-17,14,1,1.1.0.1.;-1;3;500;3,1,
route finder:
start: saulėtekis
end: rugių st.and you will see how to reach ;)))