Translation site here:
https://www.portland.gov/transportation/walking-biking-transit-safety/play-loteria-go
"LoterĂa is a traditional Mexican game, similar to bingo, but using images on a deck of cards instead of balls with numbers. LoterĂa Go is a super-sized version of this that gets you outside and walking to neighborhood parks.
Can you find the LoterĂa cards we've hidden in the streets?"
It may just be because LoterĂa is a game that primarily appeals to the Spanish-speaking population? And maybe the mailer was sent to ZIP codes with a high Latino presence? It's just about doing a targeted outreach.
Here's a booth at last week's ¡Viva Tualatin! festival - since the event was geared toward the local Latino community everything is written in Spanish first.