Paid RM18 for my meal using Grab Pay already earn me 360 points

Yes, better and much bigger space.

One world flight business class, or if u have status with one world carrier travelling one world economy class

1. collect points with CC and convert to Enrich miles, redeem a lounge voucher ....
or
2. fly with MAS and redeem a lounge voucher.

but beware, the lounge voucher can only be used when you fly MAS. If you fly other airlines, they won't let you in. 

Only the landside ones.....which is a problem if you are on the very late flights to pus or kix..... needs to give enough time to reach the very far p/q gates.....

Well, supposedly each stay in PPL is only complimentary for 3H but staffs won't chase you away based on experience shared by others.

The only lounges open at these hours are the landside gateway and aerotel ppl....so what's your problem?

Can't understand why dont you just follow your friend taking morning flight from Penang.
Overnight in Klia2 PPL is no fun at all (yes, personally tried once, taking next day 1st flight).
I am now still hesitating whether to overnight in First Class lounge, even with nice sofa.

Solution?
1) Take early flight from Pg with your friends (unless price is super expensive, you have no choice but opt for cheaper way to go 1 night earlier).
2) Pay for aerotel (room) and take a good nap there.
3) If you have few cards eligible for aerotel, try to ask whether possible to swipe 3 card x 1 hour to have straight 3 hours nap in aerotel / PPL room.
4) Go outside and find a cheap hotel, since you are not taking super early flight from klia.

You can’t come out to landside? As it is a connecting flight? Aerotel lounge is at landside though.

Landside means the public area aka shopping centre....

You fly in from Penang, go out of airside area, go to lounges....then before flying go back into airside....

Are you familiar with klia2? It's like a lounge next to mcd in Penang departure....

I see.
Yea, a bit regretted while staying there.
It was my first time entering Gateway PPL.
Imagine all chairs with only half length back support.
If not mistaken, seating in aerotel is slightly better (opposite Gateway PPL).
Will still opt for it if no better choice.

Both Gateway PPL & Aerotel PPL are at land side aka public area aka outside terminal / before immigration.
There is another PPL inside international departure hall but only open at 4am (not 24 hrs).
Yea, may get a room next round.

Landside =before immigration
•Plaza Premium Lounge, Gateway@klia2 (Landside)
• Plaza Premium Lounge, Gateway@klia2 (next to Aerotel)
•The Green Market, Main Concourse, klia2 (Landside)

Airside = after immigration
• Plaza Premium Lounge, Gate L, International Departure, klia2 (Airside)
• Plaza Premium Lounge/Wellness Spa, Level 2, International Departure, klia2

I just realised I misread pisang's post. Not sure what I was thinking that time but if you need suggestions on which PPL to visit, those I suggested are good for before immigration.

I always think Islamic banking is another form of creative accounting

Sorry no offence to Muslim