You have to time it carefully.
SPOILERS!
HOW DO I GET PAST THE NORTHEAST FIREFLOWERS UNSINGED?
Spoiler wrote: For the northeast ones, go past the first, save, than wait until right after the second one's shot and the shots from the southwest have passed before you go. I can't really explain this one.
HOW DO I GET PAST THE SOUTHEAST FIREFLOWERS UNSINGED?
Spoiler wrote: For the southwest ones, go left one unit in the first one's path of fire right after they fire, then wit a second until the northwest fireballs come and go down one unit. Then wait until they fire again and go west again, then wait, then down, and so on until you reach the bottom.
HOW DO I USE THE BRIDGES AND BUTTONS?
Spoiler wrote: Make sure you haven't touched any buttons yet. Step across the grass bridge, collect all the keys, and go to the open path. An invisible toggle shuts the path and opens the other as well as the corner where another key lies and the room where a wood button and chomper are. Use a diamond to re-activate the grass bridge and toggle the wood button twice to kill the chomper. Then once more. Re-activate the grass bridge again. Open the blue gate and step on, but not across, the wood bridge, then go back and re-activate the grass bridge again and go across. Toggle the wood button. Both wood bridges are now active. Use the last diamond button to toggle the grass bridge one last time and go to the transporters. Make sure you've collected all the keys first though, or you won't be able to solve the end of the level.
HOW DO I GET TO THE LEANING TOLLGATE AFTER THE DESERT PART?
Spoiler wrote: Use the spring and ask the chomper NPC for coins. Use the coins to open the tollgate chain. (Some tollgates require 0 coins to open BTW.) Use the key on the lower orange gate. Collect the green keys and red keys, then find the orange diamond button under a bridge and press it. Use the red key to get the magic gloves and step across the metal bridges. Time your way across the spikeyballs. The rest should be easy.
WHERE ARE THE GEMS?
Spoiler wrote:
1 in the desert area, at the bottom. It's half-buried.
5 behind the yellow gates with timers. You need blink to get them all.
1 in the yellow foam area with lots of blue gates, near the bottom. You need blink to get through the foam.
IN THE RUSSIAN COUNTRYSIDE, WHERE ARE ALL THE COINS?
Spoiler wrote: 4 are only accessible by the grass bridges. There are 8 in both houses. 5 lie under the canopy. 5 are spread out on the grass, some near the tollgate surrounded teleporter.
Not really around much these years.