Binding Of Isaac Rebirth, Red Icon

I have encountered this, wondering what it is, never picked up anything just randomed character, simple run
Best Answer
The red icon means your playing in hard mode.
It is very easy to mis-click the button and go to hard mode, so you have to be on the look out if your not ready for the immense difficulty.
Why people play on Hard Mode:
There is a "hard mode" for more experienced players, giving away a few new rewards that are unattainable in other difficulties.
What is different in the Hard Mode vs. Normal Mode:
1. Beating different goals in Hard mode will unlock new content not unlockable on Normal.
2. Beating said goals in Hard mode will also unlock any unlocks that would be gained by beating Normal mode (so you can start on hard if you’d like)
3. There will be achievements for Hard mode.
4. Hard mode will have some visual hud/menu changes so you are always aware if you are playing on Hard. (or watching someone play on Hard)
You can see where you click to get into Hard Mode here:

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What is the red patch binding of Isaac?
Effects. Grants about a 20% chance of increasing damage by 1.8 for the current room upon taking damage. The chance is affected by luck and goes up to 100% at 8 luck.How do you unlock the red key in Isaac?
In order to unlock the tainted characters following this you must leave a trinket in a boss room or item room before entering the floor after mom. Once you are in the ascent return to the room you left the trinket in on the exact floor and it will have transformed into a Key Shard allowing you to open the red key door.What does red key do Isaac?
The door where Isaac uses Red Key will be automatically unlocked, but the other doors remain locked until Isaac goes through them from inside or unlocks them from outside.What does the star mean in binding of Isaac?
The symbols show which bosses you've beaten as that character. The star is the boss room, the heart is Mom's Heart, and the downward cross is Satan.COME ESSERE PRO A BINDING OF ISAAC REBIRTH!
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Erik Mclean, Erik Mclean, Erik Mclean, Andrea Piacquadio
