Monsters Love Candy

Prepare for the grind.

Each level (except for the first level) requires 100xp * current level. So to go from level 12 to level 13 requires 1300xp. (Going from level 1 to level 2 requires only 30xp.) This requires a total of 43,430xp.

You get experience by playing games. A multiplayer match earns 25xp (always). For normal games, you get xp for the following items:
* Stars: 0 = 5xp, 1 = 9xp, 2 = 12xp, 3 = 20xp
* Boost monster: Common = 3, Rare = 7, Legendary = 15, Mythical = 20
* Evolved monsters: Common = 1, Rare = 3, Legendary = 6, Mythical = 10
* 5xp bonus for evolving a monster for the first time.

Hence, a typical game when you're grinding will earn 3 stars evolving a legendary monster using a rare boost monster earns 33xp (20 + 7 + 6).

If you're grinding, you'll want to use the last areas of the worlds (where you are guaranteed a legendary monster). Each game will take about 2 minutes (1 minute for the game; 30sec for the ad to let you replay; and 30sec for other screnes). That's 6 minutes per 100xp or about 1 hour per 1000xp.

Alternatively, you can grind on the early levels in a wave. You earn slightly less xp per round (since you're going to be evolving a common or uncommon monster instead of a legendary) but you don't have to sit through the adds. [Idea courtesy of Chris8875.]

Playing multiplayer matches also has the advantage of not actually having to play the round as you get 25xp no matter what your score. However, sometimes MP matches take a long time to start or don't work at all.

(I've earned almost every other achievement by the time I reached level 12 with about 8000 total xp. That still leaves about 35,000xp left to go or about 35hours.)

I have been boosting my levels using the multiplayer system. You get 25 xp per match just for playing one. Your score dose not effect how much experience, so you can work on matches while doing other things. Personally I have been boosting Seriously at the same time as I have been working on this achievement.

All I do is set up either a rematch with someone I randomly played with previously. You will get set up in a match quicker than watching a commercial and you might be helping someone else out. Because your score dose not matter I just make a match or two and ignore the rest of the match. This helps boost their wins and sometimes you get a win as well. With luck, you will find people who complete their rematch quickly and send you one back or you can re challenge them after they complete the previous challenge.

If there is not anybody available, I search for a new random player and start a fresh challenge.

Level / XP Needed / XP Total / % Complete
1 / 100 / 100 / 0.23
2 / 200 / 300 / 0.69
3 / 300 / 600 / 1.38
4 / 400 / 1000 / 2.30
5 / 500 / 1500 / 3.45
6 / 600 / 2100 / 4.83
7 / 700 / 2800 / 6.44
8 / 800 / 3600 / 8.28
9 / 900 / 4500 / 10.34
10 / 1000 / 5500 / 12.64
11 / 1100 / 6600 / 15.17
12 / 1200 / 7800 / 17.93
13 / 1300 / 9100 / 20.92
14 / 1400 / 10500 / 24.14
15 / 1500 / 12000 / 27.59
16 / 1600 / 13600 / 31.26
17 / 1700 / 15300 / 35.17
18 / 1800 / 17100 / 39.31
19 / 1900 / 19000 / 43.68
20 / 2000 / 21000 / 48.28
21 / 2100 / 23100 / 53.10
22 / 2200 / 25300 / 58.16
23 / 2300 / 27600 / 63.45
24 / 2400 / 30000 / 68.97
25 / 2500 / 32500 / 74.71
26 / 2600 / 35100 / 80.69
27 / 2700 / 37800 / 86.90
28 / 2800 / 40600 / 93.33
29 / 2900 / 43500 / 100.00
30 / achievement unlocked!

So when you reach level 21, you are halfway there ...

The other guides are very good on explaining how the XP gaining works and providing methods for gaining XP, although they are outdated, as of 2021.

So here's a solution for those who already played the game before it was delisted but are going for this achievement after the game was delisted and multiplayer features were shutted down.

Achievement status

Currently unlockable, as of February, 19th, 2023.

Downloading and installing the game (again)

You won't find the game by simply searching on the Windows Store, as it was delisted a few years ago.

Therefore, you've got two options, assuming you downloaded and installed the game on your Microsoft Account back when it was available:

• OPTION 1: Use "My Library" on Windows Store app. Check this guide on how to do this: https://www.tenforums.com/tutorials/20361-install-your-apps-...
• OPTION 2: Use the official Windows Store link, which should redirect you to the download section of the app: https://www.microsoft.com/store/productId/9WZDNCRFHX64

Edit: If the 'Install/Play' button doesn't appear, keep refreshing the website. As of February, 2023, this is working.

Getting XP

With the game installed, your past progress in the game is saved on the cloud and you can resume from where you stopped.

Since multiplayer doesn't work anymore, you'll need to get XP by playing the regular levels over and over.

Here you have two main options, depending on you have gotten or not the 2X coin multiplier back when the in-game store used to work.

If you don't have the 2X coin multiplier, then you should use JUMPER and make sure you make more than 1.5 million points in each match, otherwise you'll lose coins and won't be able to use Jumper all the time. JUMPER is a rare monster found in the Caves.

If you do have the 2X coin multiplier, then you can alternate between JUMPER and MEEMO or use MEEMO all the time, in which case you must get more than 2.1 million points per match, otherwise you'll lose coins. MEEMO is a legendarey monster found in the Caves as well.

Stay on the first 3 worlds (Forest, Desert, Cave) and play the 5 last stages of each world to give you better chances of facing a legendary monster, so you can earn more XP. To avoid losing coins, specially for those who don't have the 2X coin multiplier, you should also play the early stages of each world.

At last, if you find yourself at later ranks with a huge amount of coins or purple gems, remember you can simply start a match using a high level monster and let it idle. You won't score, but you'll get XP, sometimes more than 20, depending on which monster you are using.

Final note

I must say this is the achievement I'm most ashamed of unlocking. Such a boring, pointless and painful grinding. I'd rather never started this game at all.

Disclaimer: since this is a delisted game, with some discontinued features and the solution relies on store links, the provided solution might not work forever. Any updated news regarding the game download or the achievement status is welcome.

Thanks.