To get a higher map level, do I just have to whistle once for a higher level before finishing? Is that it? I keep ending up with a bunch of level 0 maps

you can spin in a t1 maze, and explore the maze at lvl 60+ if u want, but there is no guaranties that it will be higher than a t1 anyway.
You might get a t1, you might get a t14.

Angelic embossed mountain map
Level Req: 25
Use Item to Receive Effect

+133% Warm Light Effectiveness
+36% Experience Gained
Quantity: 5
+11% Swarm

Started a map at lvl 49 and finished at 61

Rare patched mountain map
Use Item to Receive Effect

+1 Rooms
Quantity: 2

ah i just saw this ^^ (idk if anyone else allready posted it.. but i will just do it)

From Paul:

"The following Objective rewards have been increased as follows:

A Pinch of Evil: +1 to 2 Stat Points
Bits and Pieces: +2 to 4 Dexterity
Face the Evil: +2 to 4 Stat Points
Stop the Seven Shamans: +100 to 200 Max Mana
Treasure Pest: +1 to 2 Item Slots, +2 to 5 Stat Points
Soften the Sneaky Shell: +7 to 15 Vitality
Ambush!: +5 to 10 Dexterity
Elemental Education: +5 to 10 Intelligence
No Maze No More: +7 to 15 Strength"

For maps, if it has no level requirement (lvl 0), is it bad to play the map when I'm at level 30 or something?

Yes, there is a monster level cap on each map.
Unless there is a +mob lvl cap (AS A ROLL ON THE MAP) it goes like this;

Tier + 2 x5
So if you're a tier 1 = lvl 15 (1+2 x5 = 15)

t2 = 2+2 x5 = 20
etc

This post was edited by RistVaLL on May 28 2016 11:39am

I always used tier X 5 + 10 haha yours seems a little easier but all works out to the same

Well you could also just say +25 (on t4++ maps)
15
20
25
30 (t4) at this point it's always +25..

WTF math skills do you have bro?
That's .20

xD

I love these new events btw. Makes the game more fun!