Lums are scattered throughout the game and you should get a good amount of them just by playing regularly. However, even a complete playthrough (all levels, all teensies, all lucky tickets, level 10 "Awesomeness", etc) is usually not enough to reach the 1000000 lums goal required to unlock the final hero and the "Sooo rich!" achievement (Ubisoft account only, as the game has no achievements on Steam).

The following actions grant extra lums to the player, each one having shortcomings though:

• Replaying levels of the game. This option is self-explanatory, very time-consuming and not that efficient (for the most part of levels).
  
• Checking the creatures gallery daily. Maybe the easiest source for extra lums, creatures generate purple lums and skull coins once a day. A full gallery grants a remarkable amount of 972 lums, but this option will still take a lot of time because only one spawning occurs every day.
  
• Playing the daily/weekly online challenges (possibly getting diamond cups). This was the best way to get extra lums without getting bored (it still required some weeks/months of commitment though), but servers have been shut down a while ago so this is no longer a viable option.
  
• Claiming the Uplay awards with the Uplay points in the dedicated application. Uplay awards for this game are no longer available, so this option is not a viable one much like online challenges (and it was limited anyway).

In this guide, I will provide two methods to farm lums (sort of), measuring their efficiency in "lums per second" (lums/s). The first method is slower but only requires a good familiarity with the game mechanics, while the second method is way faster but involves a little trick (with minimum risks). For the purpose of this guide, I called the former method "the Rayman way" and the latter method "the Raymesis way", but please note that you can use whatever character you prefer for both methods.

The first method requires the level Mariachi Madness to be unlocked in the Fiesta de los Muertos world. Some familiarity with the level could be helpful too.

Both methods require a populated creatures gallery (minimum 1 creature), however a full gallery is highly recommended: the more creatures have been unlocked, the more lums will spawn.

Also, some time and patience are mandatory whichever method you choose, but I hope they will help you reach the 1000000 lums goal faster than commonly allowed.

The first method is quite easy and straightforward: it consists in repeatedly playing the third music level of the game, Mariachi Madness. This level includes 708 lums and takes about 1:40 minutes, resulting in a good ratio of about 7 lums/s.

Mariachi Madness is quick, enemies/obstacles are not very dangerous, and lums are generally easy to collect. Many players suggest this level as the best one to farm lums and I tend to agree, based on my playthroughs.

I also suggest visiting the creatures gallery once a day and getting all the lums/coins, for a welcome 972 lums bonus.

The second method allows to speed up the spawning of lums in the creatures gallery, using a "time-travel" trick. In fact, shifting the system/computer date by 1 day (back or forward) makes the creatures generate all the lums again, without even having to exit the gallery first. The game pauses as soon as the related window loses focus, and lums spawn again as soon as the game resumes.

Since a full gallery grants 972 lums and collecting them is a matter of seconds, the result is an impressive lums/s ratio. The actual ratio depends on how fast you are at going through the steps: collecting all the lums, changing the system date, and then getting back to the gallery for a new harvest.

Here are some tips, based on my experience:

• Playing in "windowed" mode (and at low/medium resolution) can reduce the time for switching between the game window and the date/time settings window. Keeping the two windows close to each other might be good too.
  
• After a few tries, I decided to focus on the skull coins since they represent the largest contribution to each crop. This way I was also able to produce new crops sooner.
  
• Being consistent is the key. Some crops will obviously be slower than others, because of inaccurate moves or missed lums/coins (or accumulated boredom). Getting 1 million lums takes time, better to take a break in case of bad performance.

For reference, I was able to settle on an average of 100 thousand lums every 30 minutes, which is about 55 lums/s.

Finally, here are some safety tips:

• I made sure of setting the date so that it was always prior to the actual current day. Although not mandatory, I just preferred to avoid travel into the future. 🔮
  
• If shifting the date doesn't work and no lums spawn, try to shift the time too (a few hours should be enough). This expedient also solved some random issues I encountered during my tests: in such cases, give it a try.
  
• In general, be aware of what you are doing and do it with caution. Although no issues occur usually, weird things can happen when changing the system date/time (ex. websites not working, apps crashing, data desynchronizing). Start making a few tries and check if everything else is still working properly, before continuing.

Eventually, you'll reach the 1000000 lums goal in a few hours.

Thanks for reading this far, I really appreciate it!
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That's all, folks! 🐷