A coloring of all plane points with coordinates belonging to the set $S=\{0,1,\ldots,99\}$ into red and white colors is said to be [i]critical[/i] if for each $i,j\in S$ at least one of the four points $(i,j),(i + 1,j),(i,j + 1)$ and $(i + 1, j + 1)$ $(99 + 1\equiv0)$ is colored red. Find the maximal possible number of red points in a critical coloring which loses its property after recoloring of any red point into white.
To solve this problem, we need to find the maximal number of red points in a critical coloring of the plane points with coordinates in the set \( S = \{0, 1, \ldots, 99\} \). A coloring is critical if for each \( i, j \in S \), at least one of the four points \((i, j), (i + 1, j), (i, j + 1), (i + 1, j + 1)\) is colored red, with the condition that \(99 + 1 \equiv 0\).

1. **Initial Setup and Definitions**:
   - Let \( r \) be the number of red points.
   - We need to ensure that each 2x2 square on the grid contains at least one red point.
   - We aim to find the maximum \( r \) such that the coloring is critical and loses its property if any red point is recolored to white.

2. **Constructing the Argument**:
   - Consider the grid as a collection of \( 100 \times 100 = 10000 \) points.
   - We need to cover each 2x2 square with at least one red point.
   - Suppose we have \( r \) red points. We can choose \( r \) 2x2 squares, each containing exactly one red point, ensuring that each red point is in one of these squares.

3. **Average Calculation**:
   - In each white cell, write the number of chosen squares that contain it.
   - The average number written in the white cells is given by:
     \[
     \frac{3r}{10000 - r}
     \]
   - This average is increasing with \( r \) and equals 3 when \( r = 5000 \).

4. **Bounding the Average**:
   - We claim that this average cannot be more than 3.
   - If a number greater than 3 is written in a white cell, then the number must be 4, and it must come in the following configuration:
     \[
     \begin{array}{ccc}
     R & 2 & R \\
     2 & 4 & 2 \\
     R & 2 & R \\
     \end{array}
     \]
     Here, \( R \) represents a red cell, and the numbers are what's written in the white cells.

5. **Pairing and Averaging**:
   - We can pair each occurrence of 4 with the white cell with 2 right above it, and the average of this pair is 3.
   - No white cell is part of two pairs, so by averaging over these pairs and unpaired white cells, we get the average of numbers on the whole board is at most 3.

6. **Conclusion**:
   - Since the average cannot exceed 3, the maximum number of red points \( r \) that satisfies the critical coloring condition is 5000.
   - If we have more than 5000 red points, the average would exceed 3, which is not possible.

The final answer is \( \boxed{5000} \)