Theoretical knowledge of each thought experiment presented as dialogue from historical figures. Each levels dialogue needs to be “completed” for the corresponding gameplay to be unlocked, but can be skipped with the skip button on the first pop-up screen of each level, or the fast-forward button in the bottom left of the dialogue

Gameplay segments of each thought experiment. Progress on levels are reset when you exit a level, but stars are saved

30 consecutive challenges on a time limit. Challenges are altered versions of gameplay from Sim Mode

Switch the lever so that the trolley is directed towards the upper track

Do nothing and let the trolley continue on the lower track

On stage 6, do nothing and let the trolley run over the aliens on the lower track. The star will unlock automatically on stage 7

Immediately switch the lever to point towards the upper track, and switch back to the lower track as soon as the trolley starts turning onto the upper track

The donkey won’t move no matter which option you pick, or you can just do nothing, the star will unlock automatically after about 25-30 seconds depending on whether you do nothing or click on something and go through dialogue

After the first death, new items are unlocked. Use any of the items for the first time (does not matter which item)

Use all of the new items one time each (order does not matter)

Click on the left arrow, and then on the lock on the bottom right of the screen the brain is connected to. Play a memory game matching the shapes on the cards that appear. You need to match all of them consecutively; if you don’t match a pair, all of the cards reset

Click on the right arrow. You can mix the liquids in the flasks for various effects, mostly for fun. To unlock the star, add the blue liquid twice and mix

Click on the zipper in the middle of the floor

Tap the feet as they appear to walk up the mountain

Walk up the mountain five times (note: for efficiency, this can be done at the same time as the additional achievement Getting Over It)

Walk up the mountain ten times

In the Sisyphus level, knock off the hats Sisyphus wears four times (does not have to be consecutive), then scale the mountain until you’re off the top of the screen

The outcomes on all of the different stages are random each time. Just keep clicking each option until you get all four results

Put two coins in each piggy bank

Coins can be distributed however you like, as long as the person who is “you” has no coins after the veil is removed. The easiest way to do this is put all ten coins into one piggy bank, giving you an 80% chance to be one of the people with no coins (and 20% chance to get the additional achievement Winner Takes All)

You need to accumulate a total of at least five coins, and then click the coin in the speech bubble on the bottom right. The choice you make and result in the following section doesn’t matter

In the Veil of Ignorance level, put all 10 coins into one piggy bank, repeat until you are the one who gets the coins

Collect only a few diamonds and then run into an obstacle (note: you have to collect at least one, if you have none and run into something, you’ll be forced to restart anyway), then choose to verify the amount of diamonds you’ve collected. As long as they don’t reach the dashed line, the star will unlock

The diamonds you collect cumulate every time you start running again, as long you don’t exit the level. If you exit, your diamond count resets. Keep running until you collect enough to go over the dashed line in the container. The whole container does not have to be filled, the diamonds just need to stack in a way that they are taller than the dashed line

Press S to go left

Keep clicking until the entire word is spelled out. The letters that appear are random, so it can take a short time, or a long time. Auto-clicker potentially recommended (note: for efficiency, this and One More Time can be done at the same time as the star Big Big Banana)

Completing the first word unlocks the “infinite switch”, which is an in-game auto-clicker that’s faster than clicking manually/manually using an auto-clicker. Keep it on until the entire word is spelled out

Pick up the disk on the right-hand side and insert it into the computer tower. Use the infinite switch to keep generating bananas. The narrator will remove the disk before the bananas can fully combine. Reinsert the disk and continue letting the bananas appear. The star will unlock automatically once all the bananas have combined into the XXXXL size.

Note: all of the bananas should disappear once the biggest banana appears, but if there are any additional bananas left over, the star will not unlock, and no more bananas will appear, you will need to restart the level

Unplug the button by clicking on the USB plug on the computer tower

When the kidneys fail a minigame will appear for a limited time. Rotate the pieces that are incorrect so that all of the pipes are connected. Do this until the health bar above the musician is full (1-3 times depending on how long you take on the minigame)

After saving two musicians (does not have to be consecutive), you will be prompted to answer three questions as true or false. Answer at least two of the questions as true, and the star will unlock at the end of the song (note: for efficiency, this can be done at the same time as the additional achievement Backstage)

If you’ve already completed the We Love Music star, you can click on the question mark above the musician, or when the questions appear (does not matter if you save the musicians or not), answer at least two of the questions as false. The next time the kidneys fail, instead of the minigame, an ad will appear. You can either watch the ad (for a different game, there’s four options, chosen randomly), or not click on it and let the health bar empty, and the star will unlock

In the Famous Violinist level, after saving at least two musicians and answering at least two of the questions as true to take you to the concert, while the concert is playing, click the top right of the screen where it looks folded over

Find any of the monitors where the tree is standing, and stay on the monitor until you see the tree fall

Find a monitor where the tree has already fallen

Pick any monitor and click the monitors power button in the bottom right on and off until the monitor goes dark with a loading circle and loads the Microsoft XP background. The star will unlock when the dialogue is finished

Have all of the pieces of the ship removed at the same time. You can either wait for them to be knocked off by the various events, or remove them yourself by clicking on each piece

Replace every piece of the ship. Does not work if you only replace a few pieces after the first collision, all original pieces must have been removed and replaced

In the Ship of Theseus level, one of the events that can collide with the ship is Mickey Mouse. Click on him as he sails past, and Steamboat Willie will begin playing in the top right corner

Click on the eye/get upgrades until you have at least 50 points, and click the arrow on the left

Continue gathering enough points to keep clicking the arrows until you return to the beginning (about 10,000 points needed for all arrows, not including any upgrades)

Do nothing and have all of the animals on your farm die

Have the animals eat all of the grass on the farm. You can manually tell them which grass to eat by clicking on an animal and then on a piece of grass (this will also show you the hunger meter of the animal you hover over/click on), or you can enable the auto-eater in the bottom right, which will make them automatically eat anytime their hunger is 20% or below. You want to make sure that the grass growing speed is set to 1 in the bottom right so that the grass doesn’t grow quicker than they can eat it

Have more than 10 animals alive in the farm at one time. Turn the grass growing speed up to 5 and enable the auto-eater so that they will take care of themselves and continue to click the +1 button

There’s only one path you can pick that won’t lead to failing. To complete the mission, pick the options “disguise yourself as the neighbour” (bottom right), “go to the study” (bottom left), and “pet grandpa’s cat” (right). Every other option will lead to death and will work for the Mission Failed star

Match the cats using their fur patterns or face markings to the correct box based on the tape below the lids

Place the cats in the wrong boxes, complete the minigames/watch the videos (you will need to click play in the bottom right corner for the videos to start)

Place the cats in the wrong boxes two more times (needs to be three times consecutively) and complete the minigames/watch the videos again

Complete Challenge Mode by playing all 30 challenges in a single run. You have four lives in this mode. Lives reduce by one each time a challenge is failed and increase by one each time a challenge is passed. You do not have to complete/pass every level to unlock this achievement