Survival Mode

Sandbox Mode is the Don't Starve we all know. You can no longer choose which gamemode you want to play when you start a new world. When you start the game, you are playing Sanbox Mode though you can make some customization before starting the game. You need to find Maxwell's Door in Sandbox Mode in order to get into Adventure Mode.

Sandbox (Custom)
Here you can customise how your world is going to look. There are 5 tabs Food, World, Animals, Monsters and Resources.

Under the 'Food' tab you can chose to set the number of naturally spawning Carrots and Berry Bushes to default, more, lots, less, or none.

Under the 'World' tab you can chose to set the length of a day(only day, only dusk, only night, default, long day, long dusk, long night), your starting season(summer, winter) , the rain frequency(none, less, default, more, lots) ,the length of the seasons(only summer, only winter, default, long summer, long winter, long both, short both) and the size of the world(default, medium, large, huge).

Under the 'Animals' tab you can chose the number of beefalos, talbirds( nests), pigs( houses), bees( and killers bees), gobbler( in the berry bush), rabbits and frog to none, less, default, more, lots.

Under the 'Monsters' tab you can chose the number of tentacles, spiders( nests), treeguard and hounds to none, less, default, more, lots.

Under the 'Resources' tab you can chose to set the number of naturally spawning grass, boulders, reed, sapling and tree to none, less, default, more, lots.
 * A long season last 50 days
 * A short season last 10 days
 * A long day is 14 days segments, 1 dusk segments and 1 night segments of the clock.
 * A long dusk is 7 days segments, 6 dusk segments and 3 night segments of the clock.
 * A long night is 5 days segments, 2 dusk segments and 9 night segments of the clock.
 * Resources, Animals, Foods at lots spawn in every biomes. ( except plants on rocky biomes)
 * Rains at lots is infinite