As well as the Legacy units from the previous page, there's also a large number of other hidden units (39 in total) along with 3 hidden maps that all need to be found. Rather than being on a single map, they're spread out across multiple maps.
You can access these in the same way as the Legacy units, simply load up sandbox and select the level you need, then move the camera around and find the objects highlighted to unlock all the remaining units.
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If you'd prefer a video guide, I've linked one from Billzumanati over at AchievementLand who's kindly given permission for its use here. All credit for the video is to him.
*** Spoiler - click to reveal ***
As before, once you load into a map, hit 
to enter free fly to have free access to the whole map. As with the Legacy map, while moving around the map, press in and hold 
to move faster around the map.
Now, on to the unit & map hunting.
Tribal 1
Start up Tribal 1 and enter free look. You'll want to find the spot circled in the image below.
Head over to this little valley and out the other side, turn around and face this valley. On the cliff to your left, a little way up past two orange bushes, you'll see a very short tree stump with a set of red pom-poms on top.
Look at this for a few seconds and you'll unlock the Cheerleader unit.
Tribal Sandbox
Start up Tribal Sandbox and enter free fly. Turn to the left and you'll spot a large stone pillar on your left that is slightly apart from all the others. Head towards this;
Once here, turn around to your left until you can see these trees;
Between these two trees is a little cave. Inside this cave is an animal skull. This is the item you want, so collect it;
This unlocks the Raptor Rider unit.
Without turning around, back horizontally out of the cave. Once the bent trees in front of the cave appear fully in your screen, stop and then use 
to rise high into the air. Continue until you can see the structure shown in the blue circle below.
Head towards this and you'll see a small shrine come into view. Next to a few bones and in front of a fire, you'll spot another skull.
Collect this for the Raptor unit.
Farmer 1
Start this level and turn to your right. You'll see a few trees next to a wooden cart and some hay bales. Go down to these trees from the outer edge of the map and in a small gap underneath them you'll find your next item.
This unlocks the Wheelbarrow Dragon unit.
Pull away directly backwards from this item and look to your left. You'll spot the farmhouse with the water wheel.
On this side of the farmhouse (the back), next to the tall tree, you'll be able to see a crystal ball/snow globe on a small shelf.
Collect this for the Farmer Snow map.
Medieval 1
Start the level and look to your left.
Right on the edge of the level is a small tree, not unlike the others, on a little green outcrop. This is the item you need;
Collect it to unlock the Tree Giant unit.
Rise into the air and move forwards over the trees until you reach roughly this position;
Turn to your left and in the trees, you should see a stump with a large axe buried in it.
Collect this axe for the Executioner unit.
Turn around 180 degrees and go to the opposite side of the map. At the edge of the map, turn around 180 degrees again. On your left, you'll see a ruined stone wall with 3 barrels next to it. Inside the broken barrel is your next time.
Look at it to collect the Jester unit.
Rise straight into the air from this broken barrel and look over the edge behind it to the water below.
Go into the tunnel you see here and in the middle, turn left. You'll see this;
Get close to the glowing symbol to open a door and head inside to the middle of the room. After 5-10 seconds, the room will light up and a portal will appear in the middle;
Enter the portal. It can be a bit fiddly to enter, but if you do it successfully you'll load straight into another map called Fantasy Good (the map name in the top left in this instance is called protected advance). You can quit out to the menu as soon as it loads in though, and the map will remain unlocked.
Medieval 2
Start up the level and look at the tower on the far right of the castle in front of you;
Go inside the window of this tower and look down to see a set of crossed maces.
This will unlock the Mace Spinner unit.
Back out of the window that you entered via and turn around. Head towards the trees highlighted in the image below;
Fly over them and face them from the other side.
You'll see a man impaled on a large wooden stake on the left.
Collect this for the Vlad unit.
From here, face the large castle and fly up to the top of the tallest spire.
On the top of the large tree trunk that's wrapped around the spire is a spear buried in it.
Collect this for the Cavalry unit.
Ancient 1
Travel to the lighthouse on the back left side as your spawn in;
On the opposite side of the lighthouse, at the top, you'll see a bow sat there.
Collect this for the Artemis unit.
Ancient 2
Start and head towards the building circled in the image below.
Just inside, you'll find a sword laid on a stone in front of a statue.
Collect this to unlock The Teacher unit.
Ancient Sandbox
Start and look directly down and turn to the left. Head towards the highlighted building behind the large arch.
Propped up against the side of this structure is a large fan.
Collect this for the Fan Bearer unit.
The next one is a little awkward to find. Turn around from this structure and look for a white villa with two purple bushes on top of it;
Once you're closer to it, stop and look at the building nearest to the wall on your right.
Look at the gap between the wall and the building.
Down here, you'll find crossbow.
Collect this for the Cho Ko Nu unit.
Leave this gap and turn around, then on top of the building with the two purple/pink bushes, between those two bushes, you'll find a heart bow.
This unlocks the Cupid unit.
Viking
Start and look straight down at the ground. Aim towards the area highlighted below;
In this area, the item you need is next to a square-shaped studded rock;
Specifically, it looks like a large skull part buried under snow below a tree.
Collect this for the Ice Giant unit.
Fly up into the air a little and turn around to look over the battlefield. On the opposite side, you'll see a gap between the two bits of woodland on the other side.
Get to the other side and then turn around, then under a rock, you'll see an iron helmet (fresh from Skyrim).
Collect this for the Shouter unit.
Viking Sandbox
Start and look to your left. Locate the building shown in the image below;
Enter via the grate on the side of this little building;
Inside, you'll find your first item;
This unlocks the Ullr unit.
Dynasty
Locate the bridge over the stream to the right of the large square hole in the middle of the map.
There are a few lily pads in the water. Dive down into the water just next to them and under the bridge in the middle of some reeds is your next item (the picture quality isn't great here because it's underwater).
You'll unlock the Taekwondo unit.
Leave the water and go down the large square hole in the middle of the map. At the bottom, look back up at the map and you'll see a katana stuck in the rock on one side;
Collect this for the Samurai Giant unit.
Return to the top of the map and look at the Pagoda. Approach the pagoda at the spot between the first and second tier, circled in the picture below.
Push right up against the white bit of the wall and look to your left. Hidden in the crease between the wall and the tiles, you'll slightly be able to see the next item. It's the tiny glowing yellow bit in the image below. This should be enough for you to collect it;
This unlocks the Lady Red Jade unit.
Now go to the very top of the pagoda and balanced on the top square, you should see a set of shuriken.
This gives you the Sensei unit.
Finally, fly into the sky and turn to face the back of the pagoda then look down.
Descend straight down until you see a blossoming tree attached to the side of the rock. Buried in the rock beneath the roots of this tree is another samurai sword (circled in red below).
This gives you the Shogun unit.
Renaissance
Start the level and look straight up. In the distance, you should be able to make out two small black spots. Head over to these;
As you approach, you'll discover that it's a man attached to a balloon.
This unlocks the Ballooner unit.
Pirate
Start the level and look directly down. Head towards the small wooden bridge and turn around so that you're facing away from the two wooden ships.
You should see a table with a few items on it in from of some palm trees.
On this table is a bomb on a stick.
This unlocks the Bomb On A Stick unit.
Turn around from this table and face the opposite way. look and the ship on your left (black hull with red stripes).
Look around the left of this ship and travel up to the opposite end of the ship (towards the bow). Once there, you'll spot a barrel or two floating in the water. Turn from the outside of the map to face them.
Dive under the water and look to your left where you'll see a small rock cave.
Inside this cave, you'll see a clam containing a pearl (with eyes).
Collect the pearl and you'll unlock the CLAMS unit.
Rise out of the water and look towards the cliffs ahead with the broken ship hull on top.
Aim towards the small waterfall on the side that you're facing. Enter the waterfall and find a room behind it. Next to the Captain's skeleton is a large anchor.
Collect this for the Blackbeard unit.
Leave this area and once outside, follow the rocks around to the left. Follow it all the way around, past the other part of the broken ship and them some trees until you find a stone plinth area with a cannon.
Collect the cannon to unlock the Bomb Cannon unit.
Spooky 1
Look to your left and you'll see two partially fenced-off areas. Aim towards the leftmost one, with the pumpkins within the fence.
Look towards one of the back trees, next to which you'll find a spiky fan with chains attached;
Collect this for the BANSHEE unit.
Rise into the sky, turn to your right and go to the other fenced-off area;
In here, you'll see a large skull with a red helmet.
Collect this for the Skeleton Giant unit.
The last secret is underneath the map. Turn around and rise into the air a little. Look over the edge of the map to see a gap underneath.
Go down under and turn right to see a blue tunnel area.
Inside this room is a blue portal set into the floor with black tendrils coming out of it.
Head down into this and you'll load into a new map. This unlocks the Fantasy Evil map.
Spooky 2
Start and look up a little to see a broom flying in the air above the pumpkins ahead of you.
Collect this for the Witch unit.
After this, turn to your right and you'll see an arch in the distance will a moving blue light beneath it.
Head to this and look at the lantern;
Collect this for the Necromancer unit.
Wild West
Start and head between the Hardware shop and the Hotel.
Once near the backs of these buildings, turn right and go behind the Hotel. You'll see a set of wooden stairs, some boxes, tools and barrels.
Look under the stairs, between the boxes and the buildings, where you'll find a Gatling Gun.
This unlocks the Gatling Gun unit.
Pull out, but stay behind the buildings rather than return to the main street. Go behind the Hardware shop.
Behind here, you'll spot a wagon.
Inside the wagon (you'll have to look through the bars) is a ball & chain.
Collect this for the Ball 'n' Chain unit.
Rise into the air and look over into the distance at the other side of the street. The building on the far left of the street on the opposite side is the bank.
A little closer up;
In order to unlock the final Wild West unit, you need to actually place a couple of units. To do so, press to return to the unit placement screen. Move over to the left of the screen (the red half) and place a unit of any sort in the far back left corner. I placed a clubber;
Now, return to behind the bank;
You'll now want to select a specific unit. Press 
to load up the unit selection. You'll be in the Tribal faction. Press 
to reach the faction selector and use 
to find the Pirate faction.
Select the Cannon unit and place it behind the bank.
Press 
to start the game then press to slow it all down. From there, zoom in you your cannon unit and press to take control of it. Using the & 
, move and aim it at the back of the bank.
Press 
to fire to smash a hole into the bank. Press to reset the battle, and then free fly down into the freshly-made hole. Inside is a large safe.
Collect this for the Bank Robbers unit.
Fantasy Good
Start-up and look right. Hovering in the sky is a small island with a large stained glass window.
In front of this window is a spiked halo-like item with a glowing light moving around it.
Collect this for the Solar Architect unit.
Fantasy Evil
As soon as you spawn in, you'll see a large statue ahead of you with a chain around it. There's a swirling red light just behind it. This is where the item you want is;
Go behind this statue and at the bottom, you'll find the whip item.
This unlocks the Infernal Whip unit.
Farmer Snow
Your final 2 secret units!
Look straight down and you'll see a house with a water wheel, and just to the right of this is an odd-looking blue item.
As you approach it, you'll see it a couple of arms sticking out of it.
Collect this for the Ice Mage unit.
Finally, turn right and on the other side of the battlefield is two houses with Christmas lights between them.
Head to them, then on the upper balcony of the house on the left is a present.
Collect this for the Present Elf unit.
You should now unlock;
- Secret Agent
Find all Secret Units
1 guide
5. Miscellaneous3. Legacy Units
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