If you want the hardest medals in this game, including the have a piece last for 1000 seconds before getting to the exit, here is what you do...
Note, if you don't have enough in-game money to buy what you need for this strategy, then you'll need to grind it out with sub-optimal strategies until you do. A good early strategy is just build a long line from left to right of those cheap 5 point blocks, with flag at the far right.
So end-game strategy is as follows. Put the flag at the bottom-right of the board (Select the deletion tool then click and drag the flag to move it). Make every other row full-on those slow blocks, with the exception of make every final block on the rightmost side a teleport entry block, with the exception of the bottom-rightmost is of course the flag.
Just above the leftmost slowdown block on each row, place a teleport exit block.
Make the block that's just below the spawn block be a block that looks like ">". (This stops the pieces misbehaving a bunch)
Finally, liberally sprinkle in as many vertical moving blocks randomly everywhere as you can, or as you see fit.
Then just let the game run for a long time, come back, and check your progress. There's a lot of chance involved here, but the idea is you slow them down as much as you can, until it gets to the warp to one of the random (it's not really random but let's pretend it is) entrances on the left, which gives it only about a 1 in 7 or so chance of ending on the exit row with the flag, as well as the vertical movers will both block the way as well as sometimes carry off pieces that got lucky enough to enter that final row up to some earlier row.
The more you thus delay some piece's exit, the higher points that piece will be worth once it finally does exit, and there is a fair bit of luck and chance involved, but just set the game up this way and let it run a while and see what happens. This is the way I did it.