The Four Kings Casino and Slots

RP in this game are basically Experience Points (or XP). All games require a win to earn RP except for Bingo, which earns RP even with a loss.

The "main floor" includes all rooms aside from VIP rooms (VIP and High Rollers). Don't forget you can Teleport to rooms and areas by pressing , , and then highlighting the area you want, and then pressing , . Below are the games required to earn RP on.

BIG 6
Located in the main area. Looks like a giant raffle wheel. Simply put a bet on the '1 to 1' or '2 to 1' options and match that with what the spin results in.

BINGO
Located in its own area off the main area. Playing a game of this earns RP even if you don't get the Bingo at the end. So play a game of this to guarantee RP. Must play the full the game to the end.

BLACKJACK
Located in its own area off the main area. Simply win a hand. You do NOT need to also win a hand at the Single Deck Blackjack. However, it probably counts to this as the RP is applied to the regular Blackjack level. Video Blackjack does NOT count for this.

CRAPS
Located up some stairs in the main area. I never played Craps until this game so I only have a loose understanding of the game. I'd suggest placing a bet on the Field and rolling until you hit a 2, 3, 4, 9, 10, 11, or 12.

MACHINE GAMES
These are located in the main area and also in all the other areas, including Bowling. The games in this are Instant Keno, Video Blackjack, and Video Poker. They look like Slot machines. You only need to win a hand in the latter two, or win a 4x match in Instant Keno. You do NOT need to win at all of the types.

POKER
Located in its own area off the main area. This was the last one I needed. I won a game on the Free Poker table which unlocks its own achievement, but didn't get any RP for that. Not sure if that's standard. But I'd recommend playing Ring Poker. This is a 1,000 chip buy-in game and can be joined and left at any time. Simply win a round at some point to get your RP. I also feel I had to win a couple of rounds before I got some RP, so maybe a base 100 chip win isn't enough to push the RP up. If you don't get it on the first round you win, try again. Should definitely unlock on the second round you win. I believe the RP amount is tied into the pot amount you win. Video Poker does NOT count for this.

ROULETTE
Located in the main area up some stairs and near Craps. An easy game to get some quick RP by picking Red or Black. Do NOT pick both to split. You get no RP if your win and loss in the bet cancel out. RP is based purely on the chips won in that turn. So just pick either Red or Black and if the ball lands in that colour you will earn some RP.

SLOTS
These are located everywhere in the game. All areas have Slots. These include the games Big Top Slots!, Crazy 8, Gold Rush, Millionaire Manor, Seasonal Slots (the Progressive Jackpot game that changes name based on season), Slots in Space, Spinning Cogs, Treasure Trap, and Winds of Fortune. You only need to win some chips on one or two spins on ANY of these. You do NOT need to play them all.

WAR
This is located down some stairs in the main area. A simple and fast card game of drawing one card against the dealer and hoping it is a higher face value card. Feels childish as a game and reminds me of the scene in National Lampoon's Vegas Vacation where Eddie takes Clark to the "fun" casino (Guess Which Hand? hahaha). Anyway, win a hand at this and you'll earn your RP.

Having done that, you will unlock the achievement.

To check your status on this achievement - Press then to the Single Head icon. Highlight your large stat icon and it should show the list of games and your level (x/40). Highlighting one of these games will show if you earned RP on them yet via the level bar.

If I've left anything out let me know and I can add and edit. This is a very easy achievement with a higher than needed ratio.